We are often asked to explain why our solar hot water systems can produce so much more energy than standard solar hot water systems.

Here we explain how our technology works, what design issue’s help your wallet most and why it is important:

BRIEF HISTORY FIRST: Solar Hot Water Collector’s were originally designed in 1891 by the California Lightbox Company, (the flat plates of today). Solar Collectors around the world are all made in sunny climates and exported to other regions. The problem arises when these other regions do not have the same sunny weather and the products do not perform very well. Solar Collectors are measured primarily for their “light conversion efficiency”. When you live in a country where it is typically cloudy, then all you get is diffused light, not sunlight so other factors come into play.

A Solar Hot Water collector that is optimised for sunlight WILL NOT be optimised for diffuse light. If you have a Solar Collector optimised for diffuse light, it will give excellent performance in cloud, over 60C, and it will detune sunshine so no overheating. Surface Power has the only diffused light solar technology that we know of. 

Now add to this fact that historically, its all about solar hot water “collectors”. What about the system performance?. If you buy the winning engine in a Formula 1 race, you won’t win the next Grand Prix. It’s the sum of all parts, and how they scientifically interact with each other and it’s even more critical when you only have diffuse light (cloud) as your main energy source. It’s also key in cloud that you incorporate “heat retention” technology due to low light levels, existing solar thermal CANNOT do this.

If you install a sunshine based solar system, then you will be unimpressed when compared to a Surface Power’s system performance and your savings will be limited in the UK & Ireland where cloud cover is the main feature of our weather systems. The bad summers and excellent performance from Surface Power system’s currently showcases that situation.

1) How does Surface Power’s patented technology work:

Surface Power has developed a finely tuned solar hot water system science which looks at ALL the elements of the system and how it performs in diffuse light. Our MPPT-t technology is an advanced diffused light Thermodynamic science (inertia retention technology) which we have developed and patented and is only available from us, in fact if truth be told, experts in the industry struggle to understand our science BUT THEY HAVE NO PROBLEM UNDERSTANDING THE OUTSTANDING PERFORMANCE.

THE LEGACY SOLAR STUFF: Legacy Solar Flat Plates & Vacuum collectors use DTC “Differential Temperature Control”, a very inefficient ON/OFF cycle. They also talk about “conversion efficiencies”. The big problem with this old style format in country’s with lots of cloud is that you need so much collector area to get any real benefit, that when the sun comes out you have huge overheating issues. (you may be familiar with the phrase, I get loads of energy when I don’t need it and none when I do)

SURFACE POWER’s TECHNOLOGY: Surface Power’s collectors may look similar to other Vacuum collectors on the outside but that’s where the similarity ends. Inside is a brand new system science called MPPT-t (Maximum Power Point Tracking – thermal). Surface Power have developed not just a superb aluminium solar hot water collector with a huge lifespan BUT also a complete system science which is optimised for diffuse light and you can install East, South and West and even North facing. Light is everywhere !!!

2) So how does that system science perform:

The industry is constantly using theoretical performance of solar collectors as evidence of performance, we think the day for theory is long past. This may be in the form of software print-outs or collector test reports; none of which can be used to hold the manufacturer, supplier or installer accountable for performance issues. There is plenty of evidence that this theory is never actually delivered in practice with the 2010/2011 Energy Savings Trust study (in partnership with the UK & Irish Governments) of 88 systems installed in the UK & Ireland , where the best system delivered 98% of total hot water annually and the worst delivering only 9% of annual hot water needs. Surface Power are the only company putting their reputation on the line in regards to performance. We don’t do theory and our stated outputs are actual Government certifications and metered outputs NOT software programs. We are the Ferrari of performance and we prove this everyday with our metered systems as a standard option.

In the example below taken from a major study done in the UK & Ireland in 2010/2011 over 12 months. The Surface Power system in this metered customer was the number 1 performing system BUT the number 2 performing system was a leading European system in a customer site in the same region; and we can clearly see the difference in our system science versus the “best of rest”. (NOTE: all other systems by default would be expected to perform worse than this NO 2 system below (that’s just common sense)). This No 2 system was judged to be in excellent working order in the study)

So there you have it, our secrets out, MPPT-t is a system efficiency science tuned to respond to diffused light and all our patents are based on system performance and optimisation at this range of light level.

There is a good reason why every other solar manufacturer does not “measure” the output of their solar hot water systems, why would they, the news is NOT GOOD. They do not want you to know that you could be getting as little as 100-240 kWhrs/m2/yr of DELIVERED ENERGY….

We think the Industry has an obligation to show output performance as a metered option. The smoke and mirrors would end overnight. Imagine buying a car from a salesman who told you it did 120 mph but they forgot to install a speedometer !! (translation: It won’t really do 120 mph but we won’t be giving you any way of proving it.)

 3) How does performance impact system design and savings:

Pounds, Shillings and Pence. This is the reason we invest in solar heating or hot water technology.

Question, is the highest kWhr/m2 performance per year the most important factor in choosing solar hot water/heating, Answer, NO. The first criteria to be met is service temperatures. What does this mean?

The service temperature of hot water is 40C, this is your 100% daily temperature requirement. This means the boiler is OFF. Any less than this and your boiler is ON and this is a BIG DEAL on oil/gas costs and efficiency.

Boiler “hot water only” efficiency is terrible. If your house is not zoned, or your boiler is outside, it could be less than 20% efficient. BRE in their latest study (2012) for hot water efficiency of oil combi-boilers stated they underestimated SAP’s hot water heating efficiency losses by 75% and now declare the new efficiency to be ONLY 37%. That means only, 37% of the oil used gets turned into hot water. For hot water ONLY for 4 people in a house over 6 months of summer ONLY, that would equate to €600 of oil; and at 20% efficiency, it would equate to €1,100 worth of oil just for heating hot water in the 6 months of the summer at today’s prices, Sept 2012.

To understand let’s look at 2 examples.

Customer 1 below is a Surface Power customer, he will achieve 40C or higher even on miserable days because we use daylight. A daylight day is much longer than a sunshine day. This boiler and Immersion will be OFF typically for 6 months if not longer. In the study mentioned above, an SP501 PRO produced minimum 100% daily hot water for 10 months of the year and that excluded many days at 39C which we would have considered 100% also. (Well above 70% of annual hot water needs).

Customer 2 below has a regular flat plate or vacuum system, he only gets to 35C AND HERE IS WHERE THE BIG ISSUE IS. Your skin temperature is 37C. This means you will think 35C is cold so you’ll turn on your boiler/immersion to raise it higher. BUT your boiler/immersion have a minimum 60C stat as that’s the law. So your boiler now completely unnecessarily heats your cylinder to minimum 60C so the efficiency of your boiler heating water is now even worse than before you had solar.

So meeting 100% daily temperature is KEY (40C) regardless of weather.  (top tip, to increase the kWhrs/yr, you lower the temperature of the water so be careful if someone is increasing your kWhrs/yr, they could be simply lowering the temperature outcomes by increasing the cylinder size, bigger solar cylinders mean higher oil/gas bills ) (did you know that Surface Power has been government certified to deliver MORE THAN 70% of annual hot water at minimum 54C and achieved a 5 star Energy Star rating placing our systems into the TOP 25% in the world, we are the only solar thermal company in Asia, Europe or the US to achieve this.)

 4) So let’s do what we love best, lets prove it:

 Below: End of day production: 8th December – WINTER, Cylinder at 56C.

Below: Early Morning 7:07AM : 9th June, Collectors at 43C, in production, DELTA of 12.5C already. 100% of hot water (40C) will be delivered before 9am.

Below: Midday production: 6th September , Cylinder at 84C. NO CENTRAL HEATING AT ALL. EAST FACING SYSTEM.

Below: Production: 11th June – 10:10 Morning, Cylinder at 74C, bottom nearly 2.5C higher than top, cylinder not able to stratify as fast as the heat is coming in at 10am in the morning !!..

Below: Early morning production: 22th July – North Facing System @: 10:10am, Collectors at near oil/gas boiler temps.

Below: Lunchtime production: 7th September- Solar Hot Water, Central Heating & Pool Installation, system running all services.

Below: Evening production: 7th September- Solar Hot Water, Central Heating, nearly 5pm, EAST FACING SYSTEM and the collectors are still at oil/gas boiler temperatures.

 For ongoing LIVE performance, please go to the LIVE section on our website, www.surfacepower.com

 4) So what is the difference in profile’s of Surface Power and Ordinary Solar Thermal: (let’s look at a WINTER’s day in the same area)

The following profile is a 24 hour data profile of a “leading industry vacuum” system on 2nd October, 2010.  Notice how the top and middle of the cylinder get heated by the immersion and the collector only heats the bottom of the cylinder up to 43C. Believe it or not, for this time of year, this is not a bad performance for legacy solar thermal so it tells you the day is OK. 

This profile below is a customer’s Surface Power system on the exact same day, 2nd October, and you can see the difference between old style DTC “Differential Temperature Control” above, the ON/OFF legacy method of performance and below you see MPPT-t, the constant performance maintaining a Delta T over the whole day of approx 12C. The Surface Power system below has less sqm of collector per L/water in the cylinder also. This is the difference between “Diffused” technology and ordinary sunshine collectors. It’s like having a Ferrari instead of a Fiat.

MPPT-t is a patented science which runs ALL DAY and yields multiple times more energy and higher temperatures than legacy solar.

5) So what are the real benefits of a Surface Power diffused (daylight) solar thermal system over conventional systems when the local weather is predominantly cloudy:

The REAL benefits are simple:

• You can have smaller systems to do the same task
• You can get much more performance per sqm installed
• It does not need to face south, (light is everywhere)
• You can use it for Central Heating, (radiators OR underfloor)
• You can retrofit central heating into any age or type of house
• You keep your existing radiators and plumbing
• You get much quicker payback
• The system performs even when its raining !!
• The system runs cooler on hot days, no overheating
• No breakdowns, stagnation or service calls
• Your boiler is OFF permanently for months
• It’s has a lower sqm price than other professional systems
• Your system can be LIVE online
• You get a 20 year performance warranty
• You’ll collapse your oil or gas bills
• You’ll smile more often !!

6) The patented technologies we use ? (but won’t tell you about as they are secret)

• Thermodynamic Oxygen Rebounce are microscopic semiconductor layers, invisible to the human eye which interact with the oxygen in the circuit fluid (the worlds best insulator) to block heat loss. (this is a patented heat retention technology we own)
• Harmonic Disturbance Coatings are microscopic semiconductor layers, invisible to the human eye which interact with the harmonics of the system’s laminar flow creating extra heat within the system flow lines thus allowing continuous operation of the system at a positive Delta-T. (this is a patented heat amplification technology we own)
• Microwave Friction Layering applied as a semiconductor layer, this is a heat creation technology but we will not disclose any details on this.
• MPPT-t, “Maximum Power Point Tracking-thermal” is the optimisation of the power band in the laminar flow. It is how the science mantains a constant Delta-T between 10C and 25C.
• Laminar Flow Lines, all our systems are designed to run Reynolds numbers less than 2000. Hence, you must use all the system equipment for the science to be fully optimised and this is the reason why we must design all non standard or commercial systems. (which is a free service)

+++++++++++++++++++++++++++++++++++++++++++++++++++

Surface Power pride itself on performance. We are the Ferrari of Solar Thermal.

AND WE CAN PROVE IT EVERYDAY IN EVERY WAY.

Installation Case Study: MAJOR HOME RETROFIT UPGRADE PROJECT

Contractor: DB Mallory Ltd, ST. Saviour, Jersey, www.dbmaloreyltd.co.uk (Surface Power Design Team Approval)

Location, St Ouen, Jersey, Channel Islands.

Major retrofit project, home Insulation upgrade and Solar Central Heating Upgrade to provide FREE Heating for 4 zone upgrade, Hot Water (1), Central Heating (existing radiators approx 3,000 sqft home) (2), Multi-Bathroom Heating & Towel Radiator zone (3) and outside swimming pool.

Our Solar Thermal system replaces the homes 2 existing oil boilers in the operational design. At 13.3 sqm of collector area, this is the same aperture size as approx 5 flat plate collectors which would only be suitable for hot water only. This should help you understand the outstanding performance output of our solar thermal systems technology which was designed for high performance applications such as Central Heating, Air Conditioning & Refrigeration.

You can follow that performance LIVE 24/7 online.

Remember, Surface Power’s SP501 uses advanced semiconductor solar thermal technologies and only requires daylight so it loves cloudy weather. This solar thermal technology is patented and proprietary and not available from anyone else.

This installation has numerous configurations but the basic one is a 600L thermal store which is restricted to max 40C approx (hot water shower temp) and heat is sent to other zones on request (central heating zone, bathroom radiator zone and/or swimming pool zone) automatically controlled by stats and the control system. The system ALWAYS maintains 600L of hot water availability at all times. ALL FREE. If there is any shortfall in winter, the pool heat from the day can also be returned to the house at night time.

The average oil bill for this type of home is around £5,000-£7,000 a year currently (over £15,000 a year expected cost by 2020) which means that payback on this system will be incredibly quick with the system saving hundreds of thousands of pounds over it’s lifetime for its owner.

This installation utilises the existing central heating radiators and equipment, approx 15 years old and there are no legionnaires requirements as there is no water storage, just heat exchange.

Follow the system 24/7 online HERE, (click the blue icon on the Channel Islands)

What would you expect from it ? (MODEL: SP501 HEAT1, Central Heating & Hot Water System – retrofitted into bog standard concrete house (built 2001) with radiators)

Firstly, this system was installed in Jan 2005, has had it’s 5 year service in 2010 and it’s insulation pipe protection re-taped and is not due another fluid service until Jan 2015.

Here’s what it looks like: (it’s looks superb, like it’s a year old)

(Note, silver tape is special bird repellent tape required for this install)

And how does it perform after nearly 8 years ?

This system over the last 2 days was able to operate for over 17 hours at temperatures above normal boiler temperatures ALL FREE just using daylight.

On a 100% overcast day, this system will operate at temperatures higher than 60C.

This system made PAYBACK in year 5.

Every year since payback is now putting considerable cash savings back into the house so the increases in oil or gas prices in future will have a much smaller impact.

Ongoing performance is critical for getting the highest tariffs under the Renewable Heat Incentive in the UK.

Did you know Solar Vacuum collectors with a rear reflector (CPC – Compound Parabolic Concentrator Vacuum collectors) should be cleaned every year or performance drops away after a study of MOSS buildup in Ireland & the UK ?

Have you been told that your solar collector’s are self cleaning and don’t gather any moss ? OR that they are maintenance free ?

Well, that information may be very misleading regarding CPC collectors in the UK & Irish climate….

Here we will demonstrate the issues of Moss buildup and maintenance requirements on two different solar collector designs.

Firstly, lets look at a Surface Power SP501 solar collector.

This following solar collector is from a Surface Power customer’s system that is nearly 8 years old. It is spotless and has never been cleaned. This is because the collector has self cleaning pyrex glass and is a forward light design collector. The system is cleaned by natural rainfall. (A forward light design collector only receives light energy from the front and sides). This SP501 collector requires ZERO annual maintenance and continues getting 100% of its light.

       < Perfectly clean with no maintenance required ever, (SP501)

BUT if you look behind the tubes, you’ll see something which is a BIG PROBLEM for collector designs which use rear reflectors, known as Solar CPC Vacuum collectors.

 So, let’s be clear, you WILL have a build up of Moss behind every tube on every make of solar hot water system in the UK & Ireland due to the amount of rainfall. You will not be able to see it from the front but WHAT’S IMPORTANT is whether you need the light from that side of the tube for your energy as you do on a CPC Reflector type Solar Collector.

This is where CPC Solar Collectors run into problems. All this moss build up will need to be cleaned every year and it is expensive to do this.

 As Moss requires light for Photosynthesis, this means the CPC Reflector actually encourages the growth of moss quicker than normal.

 <<< On a Solar CPC type collector, the MOSS acts as a block to light required by this type of collector coming from the back and lower sides and will get progressively worse if cleaning maintenance is not completed every year.

 To clean a CPC collector requires the tubes to be removed or rotated. As only soapy water can be used and moss is tough to clean, the cleaning process is expensive at a typical approx €400 per year (quoted). (or you can just leave it and accept the reducing performance each year)

 Make Sure when you purchase a solar collector package that you get an honest appraisal of the required maintenance costs.

With Surface Power, that annual cost is ZERO…

Have a look at Surface Power’s YouTube channel….CLICK HERE OR THE PICTURE BELOW

Please note that we have systems installed south facing and today some of them were reporting temperatures in the 60C’s.

But lets look at this North facing system early morning, completely shaded for any strong light BUT as Surface Power systems only operate on daylight, it is still exhibiting excelent performance evn though its WINTER and this system faces a NORTHLY direction.

The system increased in temperature from 12.5C to 19.4C while we were watching it.

CONFUSED ?

WE HAVE ALWAYS FOUND THAT THE SOLAR HOT WATER INDUSTRY IS THE MOST CONFUSING WHEN TRYING TO EVALUATE PERFORMANCE AND THAT PROBABLY SUITS SOME PEOPLE.

Do you find it practically impossible to determine which system performs best.

Have you heard quotes like: “one of the best” or “one of the most efficient” or “look at the brand name, it must be the best”……

GOOD NEWS !!!

YOU WON’T HAVE THAT PROBLEM ANY MORE…..

Here’s why ! We’ll tell you about a government performance comparison for solar hot water that no manufacturer wants you to know about.

In Europe, there is NO solar hot water comparison system or standard, i.e. a simple, this product does X and that product does Y, UNDER THE SAME TEST CONDITIONS.

BUT, not everywhere is like Europe, the USA has such a rating system in place and many manufacturers and distributors don’t want you to know about it.

The USA decided that they would NOT accept any information on performance from solar hot water manufacturers, because THE RESULTS could be biased. They decided on a much tougher unbiased independent scheme.

They said: SEND US YOUR Equipment, We will put it into a government certified laboratory, test it under benchmark conditions, and publish the results in a public database for consumers and industry alike to make direct, balanced and fair performance and cost comparisons.

Here for your convenience, we have a download of the current database so you can now compare a Surface Power solar hot water system to every other solar hot water system in the world (over 900 other systems) as of 3/2/2012, the USA public performance database as maintained by SRCC.

ONE NOTE OF CAUTION: Many European solar collectors don’t want to be compared so they are sold in Europe with different brand or model numbers, if you cannot find a solar hot water collector on the list, simply compare the “Gross Size” figure, the “description” and google for a picture and you’ll find which one on the list is the one you are trying to identify. (Don’t worry if you find a lot of different collectors that fit, they are all probably made by the same manufacturer.)

SOLAR HOT WATER COMPARISON ! DOWNLOAD THE LIST………

OTHER LIST COMPARISONS

SOLAR HOT WATER COMPARISON IN CLOUDY CONDITIONS ! THE TOP 20………..

SOLAR AIR CONDITIONING COMPARISON ! THE TOP 20………

Surface Power’s solar hot water system was tested and certified in Palo Alto, California. The output performance per sqm aperture has been shortened to 2 decimal places for convenience.

Surface Power does not use software programs, excel spreadsheets or guesstimates when publishing performance. We use real data or government certifications. PROOF NOT PROMISES.

All the data in this list is public and maintained by SRCC, we assume that it is all accurate as downloaded. (we can confirm our results are as we hold the certificates). We are not liable for mistakes on the data as we are not the data controller making it public.

It’s another busy month in the Surface Power offices, and we are grateful for all the positive comments we get. Attack your OIL and GAS BILLS now, as our technology stills works throughout the winter …

Now that it is November, let’s take another look at how we use our proprietary and patented TDLF and MPPTt technology to give FREE heating energy to our customers. 

Here we will look at central heating and hot water as we are definitely in home heating mode with temperatures of minus 3C being recorded in the last couple of nights and daytime air temperatures of 8C to 9C.

First, we can look at an overview for the first week of November. You can see that our all year round solar hot water & heating systems are STILL achieving record temperatures in November with one SP501PRO (4.75 sqm) even exceeding 86C (186 Farenheit) in the collectors and achieving 80C in the hot water cylinder. (these are performance results our competitors would love to achieve on a hot summers day)

Remember when buying a solar hot water system, demand “Proof, Not Promises”……….

The home shown below with System 1 currently has ONLY spent approx 80 euros on oil so far this year….expected to be the same as last winter of 400 euros in total as we are told another hard cold snap is forecast for this year.

 Here are the live screen shots of the systems as taken from the public online SMART Grid.

System 1 @ 14:37, Nov 7th, 2011.

System 2 @ 15:39, Nov 7th, 2011.

System 2 @ 17:27, Nov 7th, 2011.

System 1 @ 10:24, Nov 5th, 2011.

System 1 @ 18:15, Nov 5th, 2011.

System 2 @ 18:13, Nov 5th, 2011.

System 1 @ 15:45, Nov 4th, 2011.

System 2 @ 15:43, Nov 4th, 2011.

System 1 @ 16:18, Nov 1st, 2011.

System 2 @ 16:16, Nov 1st, 2011.

Surface Power solar systems technology is now becoming recognised as the dominant leader in solar heating and hot water installations especially in poor weather climates.

The sheer power of SP’s proprietary MPPTt & LFTP technology shows itself when the days are short and weather is poor and it will be no surprise that Surface Power solar collectors hold the highest known Government TRNSYS performance certification for 783 kWhr/m2 output which is over TWICE the output of the best flat plate collectors and well ahead of the old style solar vacuum collectors on the market today.

Today, all year round systems such as the  SP501PRO below at only 4.75 sqm are setting temperatures at the end of October which our competitors would be proud of in a heatwave in summer.

The system below has already produced 3.3 million watt hours of FREE hot water in the last 13 months.

That’s the same as putting your immersion on for an average of 8.35 hours a day EVERYDAY for FREE…..

At 60C in the cylinder by lunchtime, this system has already produced approx 450L of usable shower or washing water temperature for FREE…..

And the system below, an SP501 HEAT, an all year round central heating & hot water system also well above 100% daily hot water requirements.

 Systems live at www.surfacepower.com/live.html

ALL HOUSEHOLDERS CAN NOW GET 8 HOURS FREE IMMERSION HOT WATER HEATING EVERY DAY OF THE YEAR* and avail of a government grant to do the upgrade.

NOTE: NO OTHER SOLAR HOT WATER SYSTEM CAN ACHIEVE THIS PERFORMANCE, THAT’S WHY WE HAVE THE HIGHEST GOVERNMENT CERTIFIED TRNSYS PERFORMANCE OUTPUT IN THE WORLD – BAR NONE. (WE DON’T NEED SUNSHINE, WE JUST NEED DAYLIGHT, which is just as well, as we don’t get a lot of it in the UK and Ireland)

Imagine your electric hot water immersion ON for 8 hours on average for EVERYDAY of the year FOR FREE, that’s what an “all year solar hot water system” from Surface Power can do for you as shown in a recent UK study…Forget the waffle, put your money into an energy investment which proves publically everyday it delivers, not waffling about 70% of this and 50% of the other….(Fact not fiction, PROOF not Promises)…….. 

We generally don’t update performance too much in summer as, well, lets face it, if your solar solar hot water system can’t give you all the hot water you need in summer regardless of rain, then you should probably turn it into a hen-house or something more useful…

Its now Oct 18/19, moving towards winter, weather pretty terrible, lots of rain, wind, cold temperatures, etc BUT what about our solar hot water performance now we are in these challenging times.

BELOW, we have a system yesterday on the 18th October which achieved 100% of its daily hot water even in October, at 47C in the 300L cylinder, this is equivilant to 380L of hot water you would shower with or wash the dishes. To clarify, if you have a standard copper hot water cylinder, this is typically 80L in size. If you have your insulation upgraded, then you could have NO FUEL COSTS still in October….. (this system below is one of our “all year round solar hot water systems”, you need to specify that to your installer – SP501PRO)

HERE BELOW is another system yesterday, an SP501 PRO our best selling all year round solar hot water system, only 4.75 sqm in aperture, (that’s smaller than the aperture of 2 standard flat plate collectors), and it achieved tempertaures yesterday which standard solar systems can’t achieve on the hottest day of July. 67C degrees in the 300L cylinder and that equates to 510L of hot water you would use for showers and washing. ANOTHER DAY with no ENERGY BILLS…. 

AND EVEN A NORTH FACING SYSTEM below CAN ACHIEVE 100% OF DAILY HOT WATER REQUIREMENTS in October.!

AND WHAT ABOUT TODAY……………..the 19th October. Again, the weather is poor, with rain and cold temperatures.

Already, this all year system below is over 100% of daily hot water and it is ONLY 12:06pm, just after noon. And it is still running and will hit only 55C-60C by end of day as the weather is poor.

And another all year solar hot water system below again today……

Again, at 31C in the cylinder and pulling a Delta T with the collectors of 40.6C at 12:04pm, noon, this system will achieve ALL its daily hot water (40C) by end of day making this another FREE ENERGY DAY for this customer also.

 8 HOURS OF FREE IMMERSION EQUIVILANT EVERY DAY, 365 DAYS A YEAR…. CAN YOU AFFORD NOT TO TAKE SOLAR HOT WATER SERIOUSLY ……….

Follow these and other systems live at www.surfacepower.com/live

 *, 8 hours is average, it will be higher in summer and lower in winter but averages over 8 hours as shown in a recent UK study into solar hot water performance. The system monitored was a Surface Power SP501PRO.