Energy: Conservation

Energy and Climate Change written question – answered on 30th March 2010.

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Photo of David Anderson David Anderson Labour, Blaydon

To ask the Secretary of State for Energy and Climate Change what the average payback period is for the different types of commercially available domestic energy efficient technologies, including circulator pumps; and if he will make a statement.

Photo of Joan Ruddock Joan Ruddock Minister of State (Department of Energy and Climate Change)

Information on payback periods for some technologies under the CERT regime is shown in the following table. Savings figures are approximate and are based on a typical three-bed semi-detached home. Installed costs are not the full economic cost of the work but incorporate a level of subsidy provided by suppliers under the CERT programme.

Measure Annual saving (£/yr) Installed cost Installed payback Emissions savings (kgCO2/yr)
Loft Insulation (0-270mm) Around £150 Around £250 ~ 2 yrs 750
Loft Insulation (50-270mm) Around £45 Around £250 ~ 6 yrs 200
Cavity Wall Insulation Around £115 Around £250 ~ 2 yrs 630
Internal wall insulation Around £380 £5,500 - £8,500 ~ 20 yrs 2100
External wall insulation Around £400 £10,500 - £14,500 ~ 25 yrs 2200
Draught proofing Around £25 Around £200 ~ 8 yrs 130
Floor insulation Around £60 Around £500 ~ 8 yrs 320
Hot water tank jacket Around £35 Around £50 ~ 1 yrs 200
Gas Boiler (replacing G rated with A rated) Around £190 Around £2500 ~ 13 yrs 1000

Information available at:

The actual payback period is a function of the cost of the technology, the cost of installation, the actual number of running hours per year and the cost of the fuel saved per year. As these variables are influenced by commercial considerations, which are different for each technology, and as each installation is bespoke, the actual payback period will vary considerably.

Circulator pumps are consumers of energy, though some operate more efficiently than others, particularly those that can modulate their output to match the load. We do not have the information on the payback periods for circulator pumps.

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