Heat pumps under scrutiny
Top tradesman, Jeff Howell, has put air source heat pumps under the spotlight in his Telegraph column.
Air source heat pumps... a load of hot air?
Air source heat pumps use mains electricity to achieve a desired heat. They are said to deliver three units of heat energy for every unit of electricity used - giving 300% efficiency - but Jeff is yet to be convinced.
He calculates that if standard-rate mains electricity costs 12p per unit, 300% efficiency means heat pumps deliver heat at 4p per unit. However, gas costs 3.5p per unit, and off-peak economy 7 electricity costs 3.7p per unit, making heat pumps a more expensive option.
The building expert pointed out that while heat pumps are becoming popular with the environmental movement, they would also prove a costly alternative to LPG.
Taking the installation cost into consideration, replacing an existing LPG boiler with ASHP would have a 'payback-period' of more than 50 years.
View the full article http://www.telegraph.co.uk/property/propertyadvice/3539090/DIY-advice-air-source-heat-pumps-and-damp-spots-on-an-inside-wall.html
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