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Payback - How Much Does Domestic Water Heating Cost?
 

Every home spends on average 25% of it’s combined energy bills on water heating. If you live in a newer home or one that has good quality roof insulation, cavity wall insulation and double glazing, the percentage of your bills for water heating will be higher.

At Sustainable Energy Technologies we aim to provide a round 70% of your water heating free each year using our advanced Max-Tec solar thermal system, combine this with our Air Source Heat Pump the savings are even greater.

Solar energy is a free source of energy, unlike fossil fuels. You only pay once for the system which provides you energy, not for the energy you use.

Payback

People always ask “what is the pay back for solar thermal systems”. Well first and foremost it does have a pay back. If you buy coal, oil or electricity or gas, the supplierdoes not offer you any pay back at all. No matter how much you buy or no matter how long you buy it for, you never get your money back. You have to service, maintain and renew your boiler.

If you take a real view of payback, you have to factor in future energy increases, take account of inflation, and the savings made due to the boiler been used less and lasting longer.

Doing the sums properly most thermal systems offer a pay back of between 6 and 15 years, depending on the fossil fuel displaced, the future fuel inflation factor you use and the amount of hot water you use.
Although payback is one way of looking at the costs, it is perhaps more accurate to look at the return of investment that solar thermal offers. Typically the financial savings of a good solar thermal system will be equivalent to a tax free return on investment of between 8% and 12%.

 
Assumptions:
Fuel inflation: 15%
General inflation: 4%
Performance: 70%
Water heating as
Percentage of fuel bill: 25%
 
Current cost elements
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
Gas, Electricity & other fossil fuel costs
1200
1380
1587
1825
2099
2414
2776
3192
3671
4221
Boiler servicing
120
125
130
135
140
146
152
158
164
171
Total annual cost:
1320
1505
1717
1960
2239
2560
2928
3350
3835
4392
Accruing cost:
1320
2825
4542
6502
8741
11301
14229
17579
21414
25806
 
Sustainable Energy Technoligies Max-Tec Solar System Cost Savings
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
Fossil fuel saving
210
242
278
319
367
422
486
559
642
739
Boiler servicing (saved due to reduced usage)
20
23
26
30
35
40
46
53
61
70
Boiler replacement saving
45
45
45
45
45
45
45
45
45
45
Total annual saving:
275
310
349
394
447
507
577
657
748
854
Accruing saving:
275
585
934
1328
1775
2282
2859
3516
4264
5118
 
Carbon Savings
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
in Tonnes
0.82
1.64
2.46
3.28
4.1
4.92
5.74
6.56
7.38
8.21
 
 
 
 
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