It’s official: Surface Power customer metering study shows customers can achieve payback within 6 years at only 3% energy inflation setting a challenging new benchmark in the industry for performance and financial payback on both solar central heating and solar hot water systems.
In a long running multi-year metering study to determine 2 actual case study’s future savings, payback and other valuable information, the results are finally in. The data here from the study has been summarised to make it easier to read but the results are compelling.
This study involved assessing the house energy rating (SAP/BER) versus the new annual bills after Surface Power Heating systems had been installed by metering the customers houses as they use them every day. (it is worth pointing out that both customers had a view that the energy rating was much lower than the “actual” money they were spending beforehand), BUT this study only used the energy rating as the base point. (SAP/BER)
The climate in this location delivers solar energy levels of approx 980 kWhrs/m2/year.
Case Study 1 (RETROFIT): 2001 concrete house, (typical standard dormer construction), SEAI Home Energy Savings Scheme pilot house rated at a D2 (SAP/BER). Oil fired boiler with Surface Power solar system installed. All energy points including oil consumption metered.
Case Study 2 (NEW BUILD): 2009 timber frame, (typical standard timber frame detached house), Building Energy Performance rated at B1 (SAP/BER). Oil fired boiler with Surface Power solar system installed. All energy points including oil consumption metered. (an additional 100mm internal insulation layer was added in construction coupled with a Heat Ventilation Recovery unit).
Both houses are within 3 miles of each other, study period 2009-2013.
HOUSE 1

In the season 2012/2013, this house is rated at 36,500 kWhrs total energy footprint.
As of today, 22nd Feb, 2013, this house has used metered oil of 5,487 Kwhrs, at annual bill trend value €544.77 at Irish prices or £318.24 at UK prices.
With electricity consumption metered at 5,853 kWhrs and heat oil consumption of 5,487 kWhrs, this house has a total energy consumption of 11,340 kWhrs.
This means the house is saving 69% of its expected energy costs because it has a Surface Power energy upgrade.
The full year results from last year 2011/2012 was a full year saving of 68% over SAP/BER and a total energy consumption of 11,853 kWhrs.
PAYBACK: This means that a €16,000 investment saves approx 24,000 kWhrs a year every year which is a cost saving of 2,430 Litres of oil resulting in a payback time of 6 years. In the next 6 years following (year 7 to year 12), the system will result in cash savings of €59,382 at 3% energy inflation per year to the household and the system is solid aluminium with a 50 year design life.
That 6 year payback EXCLUDES RHI payments in the UK which will shorten it even further from later this year.
THIS HOUSE RATED AT D2 BUT IS OPERATING AT B1 BECAUSE IT HAS A SURFACE POWER SOLAR HEATING SYSTEM INSTALLED.
Customer comment: “It is really interesting to see the actual metered data, because in reality the system is invisible to anyone in the house. It just works, this is best investment we ever made, we will spend only €600 on oil this year again when our neighbours are spending thousands. When you see the numbers, it becomes clear that this system will save us more money than we could have imagined and it has taken huge pressure off our finances”.
HOUSE 2

In the season 2012/2013, this house is rated at 13,200 kWhrs total energy footprint.
For each of the last 3 years, this house has used metered oil of approx 811 Kwhrs, at annual bill trend value €79.98 at Irish prices or £47.98 at UK prices.
For the year 2011/2012 season, with electricity consumption metered at 3,150 kWhrs and heat oil consumption of 811 kWhrs, this house has a total energy consumption of 3,961 kWhrs.
This means the house is saving 70% of its expected energy costs because it has a Surface Power energy upgrade.
The full year results from last year 2011/2012 was a full year saving of 70% over SAP/BER and a total energy consumption of 3,867 kWhrs.
PAYBACK: This means that a €6,500 investment saves approx 9,039 kWhrs a year every year which is a cost saving of 891 Litres of oil resulting in a payback time of 6 years. In the next 6 years following (year 7 to year 12), the system will result in cash savings of €19,073 at 3% energy inflation per year to the household and the solar system is solid aluminium with a 50 year design life.
That 6 year payback EXCLUDES RHI payments in the UK which will shorten it even further from later this year.
THIS HOUSE RATED AT B1 IS OPERATING AT A1 BECAUSE IT HAS A SURFACE POWER SOLAR HEATING SYSTEM INSTALLED.
Customer comment: “We are spending approx €80 per year on oil, what more is there to say. We took a leap of faith, it sounded to good to be true but we agreed if it did half of what was promised, we would still be happy with the result. Absolutely no one believes me that we only spend €80 a year on oil except the oil company as we have only bought €400 worth of oil since 2009. We have a nice big house and everybody should sign up for a Surface Power upgrade.”
APPENDIX…
BELOW IS AN EXAMPLE OF THE OIL METERING DATA FROM HOUSE 1. (UP TO TODAY, 22nd FEB, 2013), current totals at the end.
| Day |
Date |
Oil Level |
Oil Meter |
Cost |
2011 |
1999 |
|
| Sunday |
23-Sep |
204 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Monday |
24-Sep |
201 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Tuesday |
25-Sep |
195 |
6 |
€6.66 |
€5.10 |
€1.74 |
|
| Wednesday |
26-Sep |
191 |
4 |
€4.44 |
€3.40 |
€1.16 |
|
| Thursday |
27-Sep |
188 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Friday |
28-Sep |
186 |
2 |
€2.22 |
€1.70 |
€0.58 |
|
| Saturday |
29-Sep |
185 |
1 |
€1.11 |
€0.85 |
€0.29 |
|
| Sunday |
30-Sep |
179 |
6 |
€6.66 |
€5.10 |
€1.74 |
€27.75 |
| Monday |
01-Oct |
176 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Tuesday |
02-Oct |
176 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Wednesday |
03-Oct |
173 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Thursday |
04-Oct |
168 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Friday |
05-Oct |
168 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Saturday |
06-Oct |
165 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Sunday |
07-Oct |
165 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Monday |
08-Oct |
162 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Tuesday |
09-Oct |
157 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Wednesday |
10-Oct |
156 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Thursday |
11-Oct |
153 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Friday |
12-Oct |
151 |
2 |
€2.22 |
€1.70 |
€0.58 |
|
| Saturday |
13-Oct |
151 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Sunday |
14-Oct |
148 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Monday |
15-Oct |
146 |
2 |
€2.22 |
€1.70 |
€0.58 |
|
| Tuesday |
16-Oct |
140 |
6 |
€6.66 |
€5.10 |
€1.74 |
|
| Wednesday |
17-Oct |
133 |
7 |
€7.77 |
€5.95 |
€2.03 |
|
| Thursday |
18-Oct |
128 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Friday |
19-Oct |
125 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Saturday |
20-Oct |
123 |
2 |
€2.22 |
€1.70 |
€0.58 |
|
| Sunday |
21-Oct |
117 |
6 |
€6.66 |
€5.10 |
€1.74 |
|
| Monday |
22-Oct |
112 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Tuesday |
23-Oct |
109 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Wednesday |
24-Oct |
107 |
2 |
€2.22 |
€1.70 |
€0.58 |
|
| Thursday |
25-Oct |
106 |
1 |
€1.11 |
€0.85 |
€0.29 |
|
| Friday |
26-Oct |
101 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Saturday |
27-Oct |
101 |
0 |
€0.00 |
€0.00 |
€0.00 |
B/H W/end |
| Sunday |
28-Oct |
100 |
1 |
€1.11 |
€0.85 |
€0.29 |
B/H W/end |
| Monday |
29-Oct |
90 |
10 |
€11.10 |
€8.50 |
€2.90 |
B/H W/end |
| Tuesday |
30-Oct |
85 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Wednesday |
31-Oct |
81 |
4 |
€4.44 |
€3.40 |
€1.16 |
€104.34 |
| Thursday |
01-Nov |
76 |
5 |
€5.55 |
€4.25 |
€1.45 |
|
| Friday |
02-Nov |
73 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Saturday |
03-Nov |
70 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Sunday |
04-Nov |
67 |
3 |
€3.33 |
€2.55 |
€0.87 |
|
| Monday |
05-Nov |
363 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Tuesday |
06-Nov |
361 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Wednesday |
07-Nov |
358 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Thursday |
08-Nov |
352 |
6 |
€6.00 |
€5.10 |
€1.74 |
|
| Friday |
09-Nov |
352 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Saturday |
10-Nov |
352 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Sunday |
11-Nov |
352 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Monday |
12-Nov |
345 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Tuesday |
13-Nov |
341 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
14-Nov |
338 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Thursday |
15-Nov |
335 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Friday |
16-Nov |
334 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Saturday |
17-Nov |
331 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Sunday |
18-Nov |
324 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Monday |
19-Nov |
320 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Tuesday |
20-Nov |
315 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Wednesday |
21-Nov |
311 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Thursday |
22-Nov |
304 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Friday |
23-Nov |
296 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Saturday |
24-Nov |
288 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Sunday |
25-Nov |
281 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Monday |
26-Nov |
278 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Tuesday |
27-Nov |
274 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
28-Nov |
270 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Thursday |
29-Nov |
263 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Friday |
30-Nov |
259 |
4 |
€4.00 |
€3.40 |
€1.16 |
€122.54 |
| Saturday |
01-Dec |
251 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Sunday |
02-Dec |
248 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Monday |
03-Dec |
243 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Tuesday |
04-Dec |
239 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
05-Dec |
231 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Thursday |
06-Dec |
225 |
6 |
€6.00 |
€5.10 |
€1.74 |
|
| Friday |
07-Dec |
217 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Saturday |
08-Dec |
210 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Sunday |
09-Dec |
207 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Monday |
10-Dec |
199 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Tuesday |
11-Dec |
194 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Wednesday |
12-Dec |
191 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Thursday |
13-Dec |
188 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Friday |
14-Dec |
184 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Saturday |
15-Dec |
179 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Sunday |
16-Dec |
173 |
6 |
€6.00 |
€5.10 |
€1.74 |
|
| Monday |
17-Dec |
165 |
8 |
€8.00 |
€6.80 |
€2.32 |
|
| Tuesday |
18-Dec |
161 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
19-Dec |
159 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Thursday |
20-Dec |
156 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Friday |
21-Dec |
153 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Saturday |
22-Dec |
150 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Sunday |
23-Dec |
143 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Monday |
24-Dec |
137 |
6 |
€6.00 |
€5.10 |
€1.74 |
|
| Tuesday |
25-Dec |
133 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
26-Dec |
128 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Thursday |
27-Dec |
124 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Friday |
28-Dec |
118 |
6 |
€6.00 |
€5.10 |
€1.74 |
|
| Saturday |
29-Dec |
111 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Sunday |
30-Dec |
108 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Monday |
31-Dec |
105 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Tuesday |
01-Jan |
100 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Wednesday |
02-Jan |
97 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Thursday |
03-Jan |
94 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Friday |
04-Jan |
90 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Saturday |
05-Jan |
85 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Sunday |
06-Jan |
82 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Monday |
07-Jan |
82 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Tuesday |
08-Jan |
79 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Wednesday |
09-Jan |
78 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Thursday |
10-Jan |
76 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Friday |
11-Jan |
74 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Saturday |
12-Jan |
73 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Sunday |
13-Jan |
71 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Monday |
14-Jan |
69 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Tuesday |
15-Jan |
67 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Wednesday |
16-Jan |
66 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Thursday |
17-Jan |
63 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Friday |
18-Jan |
61 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Saturday |
19-Jan |
60 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Sunday |
20-Jan |
59 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Monday |
21-Jan |
59 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Tuesday |
22-Jan |
58 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Wednesday |
23-Jan |
57 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Thursday |
24-Jan |
57 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Friday |
25-Jan |
57 |
0 |
€0.00 |
€0.00 |
€0.00 |
|
| Saturday |
26-Jan |
55 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Sunday |
27-Jan |
53 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Monday |
28-Jan |
52 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Tuesday |
29-Jan |
51 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Wednesday |
30-Jan |
50 |
1 |
€1.00 |
€0.85 |
€0.29 |
|
| Thursday |
31-Jan |
295 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Friday |
01-Feb |
290 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Saturday |
02-Feb |
285 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Sunday |
03-Feb |
278 |
7 |
€7.00 |
€5.95 |
€2.03 |
|
| Monday |
04-Feb |
272 |
6 |
€6.00 |
€5.10 |
€1.74 |
|
| Tuesday |
05-Feb |
268 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
06-Feb |
264 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Thursday |
07-Feb |
260 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Friday |
08-Feb |
256 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Saturday |
09-Feb |
251 |
5 |
€5.00 |
€4.25 |
€1.45 |
|
| Sunday |
10-Feb |
247 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Monday |
11-Feb |
243 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Tuesday |
12-Feb |
239 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Wednesday |
13-Feb |
235 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Thursday |
14-Feb |
231 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Friday |
15-Feb |
228 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Saturday |
16-Feb |
225 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Sunday |
17-Feb |
222 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Monday |
18-Feb |
218 |
4 |
€4.00 |
€3.40 |
€1.16 |
|
| Tuesday |
19-Feb |
215 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Wednesday |
20-Feb |
213 |
2 |
€2.00 |
€1.70 |
€0.58 |
|
| Thursday |
21-Feb |
210 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Friday |
22-Feb |
207 |
3 |
€3.00 |
€2.55 |
€0.87 |
|
| Saturday |
23-Feb |
|
|
|
|
|
|
| Sunday |
24-Feb |
|
|
|
|
|
|
| Monday |
25-Feb |
|
|
|
|
|
|
| Tuesday |
|
|
|
|
|
|
|
| |
|
Total |
541 L |
2012 |
2011 |
1999 |
UK |
| |
|
|
To Date |
€555.63 |
€459.85 |
€156.89 |
£324.60 |
| |
|
|
kWhrs |
5485.7 |
5485.7 |
5485.7 |
5485.7 |
| |
|
|
|
|
|
|
|
| No Days in heating season so far |
153 |
days |
|
|
|
| |
|
|
CURRENT 2012 |
if 2011 Cost |
if 1999 Cost |
|
|
| Kerosene/L |
€1-€1.11/L |
€0.85/L |
0.29ec/L |
|
|
| Annual Bill Trend |
€544.74 |
€450.83 |
€153.81 |
|
|
| |
|
UK Trend |
£318.24 |
|
|
|
|
| |
|
|
|
|
|
|
|