Compare fuels, heating systems and pay back times.

The Homeheater, when compared to other heaters like Oil or LPG, comes out way ahead in terms of sustainability, carbon emissions and Return on investment. It is easily connected to existing central heating or hot water systems, and the installation cost is minimal. It requires no electricity to run and should last a lifetime.

Below are some of the figures taken from external sources, like Which? magazine.

We have provided figures here from the  Energy Saving Trust or the UK government to help you compare the difference in heating solutions. The charts and links below can also be used to calculate your home’s requirements, the insulation value (U-values), and hot water needs.
Good insulation and draft exclusion is key to your overall plan, the Homeheater can use the single wrap around heat exchanger to warm low temperature radiators or under floor heating in a well insulated home or use two heat exchangers with a 70/60 supply/return temperature for bolting on to an existing system.
Whichever way you look at it the results are clear- a wood burning Homeheater will pay for itself rapidly, is very economical to run and is ecologically sustainable.
A chart comparing performance with similar output woodburners is provided below.

Fuel prices compared :

June 2013

Fuel
Fuel price (p per unit)
Unit
Pence per kWh (after boiler efficiency)
Energy content (kWh per unit)
CO2e emissions per kWh*
Electricity Standard Rate1
15.69
kWh
15.69 (100%)
1
0.590
Electricity Online Rate1
14.47
kWh
14.47 (100%)
1
0.590
Mains Gas Standard Rate2
4.78
kWh
5.31 (90%)
1
0.204
Kerosene3
57.56
Litre
6.53 (90%)
9.8
0.314
Gas oil4
72.11
Litre
7.70 (90%)
10.4
0.352
LPG5
47.95
Litre
8.00 (90%)
6.66
0.259
Butane6
136.96
Litre
19.09 (90%)
7.97
0.259
Propane7
73.43
Litre
11.54 (90%)
11.37
0.259
Seasoned Wood8
18.56
Kg
5.20 (85%)
4.20
0.025
Pellets9
28.86
Kg
6.79 (90%)
4.72
0.039
Smokeless fuel10
44.18
Kg
8.79 (75%)
6.7
0.414

Source: www.nottenergy.com/energy_cost_comparison


Cost of alternative energy:

Installation Cost
Annual energy bill savings
for gas-heated homes
Annual energy bill savings
for electric-heated homes
Ground source heat pump
£9,000 – £17,000
£40 – £70
£420 – £530
Air source heat pump
£6,000 – £10,000
£70 – £130
£330 – £530
Wood-fuelled heating
£2,000 – £11,500
About £100
About £580
Homeheater
£2,000
About £126
About £600

Using the table

Savings are based on a three-bed semi-detached house and are based on data from the Energy Saving Trust. Installation costs: Indicative cost of equipment and installation. Annual savings: Estimated for homes currently heated by gas or electricity. Savings for heat pumps are based on field trials and are given as a range depending on the performance of the heat pump.

Annual fuel cost for oil-fired heating and hot water (not including installation) : £1,355 Carbon emissions per year 4-5 tonnes.

These are estimated annual costs based on heating and hot water demands of a three-bedroomed home, they are not derived from actual fuel bills.

Source: Which? Magazine.

Homeheater stats provided by CMSC.

  Chart comparing exiting flue gas temperatures:

Name

Model

KWs

Efficiency %

Flue temperature

AGA

Little Wenlock

5.7

79

300

Villager

Chealsea

5

71

341

Hunter

Herald

4

78

270

Dovre

250

4.9

77

310

Bosca

Limit 380

7

75

484

Cornish Masonry stoves

Homeheater

4.9

84

154

The above chart proves that the Homeheater conserves around twice the heat inside your home. It is not wasted out into the atmosphere.

Comparing the pay back time:


Do the numbers add up, is it a good investment?

If you buy coal, oil or electricity or gas the supplier does not offer you any payback at all. No matter how much you buy or how long for, you never get your money back.

Various bodies define payback as the annual fuel bill savings divided by the capital cost. This is misleading. You should factor in energy price increases, inflation, servicing, and losses that a thermal system suffers. Most thermal systems offer a pay back of between 6 and 15 years, depending on the fossil fuel displaced, the future fuel inflation factor and the amount of hot water you use.

Heat pump systems:


Source: www.local.gov.uk/web/guest/climate-change

Fuel bill savings:

On estimate, a typical heat pump system could save you £160 to £840 a year. This will depend on what type of fuel is replaced.

A heat pump with mid-range efficiency can be expected to use only a third of the energy of an average existing gas boiler to produce the same amount of heat. Thus there is significant scope for considerable savings in the cost of fuel when replacing conventional heating systems.

Maintenance costs

The inverter will probably require replacement over a heat pump life span (20-25 years). This costs £1,000 to £2,000 in a domestic system.

The payback period for heat pump systems depends on the:

  • type of heat pump installed

  • age and type of building and its insulation that it is installed into (U-values)

  • the type of heating it is replacing or displacing.

Installing systems into existing buildings is more expensive than incorporating them into new designs.

These following table shows payback period estimates based on published data and field studies, assuming current electricity prices and a mid-range system efficiency. Payback periods are likely to decrease if energy prices rise and the renewable heat incentive (RHI) becomes practicable for homeowners.

Ground source heat pump

Traditional fuel used for payback comparison Payback periods without RHI* Payback periods with the RHI
Direct electric heating 12 to 18 years 6 to 8 years
New oil boilers 29 years 12 years
New gas boilers 47 years 14 years




Air source heat pump

Traditional fuel used for payback comparison Payback periods without RHI* Payback periods with the RHI
Direct electric heating 10 years 5 to 13 years
New oil boilers 16 years may not pay back within lifetime of the building
New gas boilers 31 years may not pay back within lifetime of the building

*Please note that the payback period without RHI given is the lower estimate. This could extend to not being paid back within the lifetime of the building depending on the variables discussed above. This shows that the RHI is crucial to making these systems economically viable.

Example costs for heat pumps in a detached house


The following examples indicate the costs of installing and running a heat pump for a detached house with and without the RHI. The example demonstrates the importance of selecting the correct technology for the building under consideration. In this example the air source heat pump would use much more electricity than the ground source heat pump.

This would increase the operational costs sufficiently to make the installation financially unviable as well as having a significant impact on the buildings CO2 emissions.

Ground source Air source
Heat demand of house 7,056kWh/year 7,056kWh/year
Installed capacity 5kWth 5kWth
Capital cost £6,058 £4,599
Electricity required 2,392 kWh/year 4,246 kWh/year
Operational and maintenance costs £304 per year £579 /year
If eligible for RHI
cost savings £749 per year £535 per year
payback period 14 years unviable
Without RHI
cost savings £247 per year £247 per year
payback period unviable unviable




Funding schemes

The main source of funding for heat pumps is the renewable heat incentive (RHI).


Source: www.local.gov.uk/

Oil burner:

No payback on Oil, Prices set to rise even more.

Useful links:

– Green Deal Occupancy Assessments

“Part of the Green Deal process is an occupancy assessment that takes account of the occupants’ current use of the property in order to inform about the impact of improvement measures for the specific household…”

Download page here: http://www.bre.co.uk/sap2009/

– Boiler efficiency database: SAP link: http://www.boilers.org.uk/

– Biomass facts and figures. including theThe UK Biomass Carbon Calculator


local.gov.uk – A very useful source of info.

For more info on our Homeheater, click HERE.