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We've got air heat pumps here - for hot water and central heating wet radiators . We find that the radiators take a very long time to warm up compared to say a gas boilered central heating system. We also find the system regularly flushes itself with freezing cold water, thus cooling the hot water and radiators. And the Mitsubishi fans are noisy, especially when mounted next to the building - as vibration sound comes through the foundation, and where it's bolted to the wall.

This is a comment on "Heat Pumps"

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Of course the radiators take longer to heat up than a gas boiler, thats why a heat pump is more efficient than a gas boiler, its like putting your foot on the accelerator pedal of a car, you shouldnt be switching it off at all they run on a constant trickle of heat controlled by your thermostat, and the rads sit at a constant temp.

More likley to be poor installation/commissioning. The outside unit should be installed on semi flexible feet and attached, if necessary, to the wall with a non rigid connection.

Yes the flow temperature from a Heat Pump is lower than from a conventional boiler and this should have been made clear to you and factored in to the sizing calculation by your installer. Sometimes this means that some radiators may have to be increased in size and usually the pump is operated for longer periods than conventional high temperaturel fuel boilers. This increases effiiciency. Lastly, the initial setup of the flow controller is critical and if the installer has just left it at factory settings without taking into account your requirements it is unlikely to be working correctly.

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Household Energy Costs

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All calculations on this site are based on current fuel prices they are checked regularly are automatically updated and were last changed on:-
19^th February 2013
For complete clarity, all calculation using current fuel prices are coloured red.

The costs calculated based on these fuel prices should be regarded as 'good estimates', given that fuel prices vary in different parts of the county and at different time of the year.

The calculations also have different levels of accuracy depending on the nature of the calculation. For example calculating the energy use of a known power output TV is very easy compared to calculating the effect on energy savings when insulating a cavity wall.

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The main units used in this site are in the table below, For a complete explanation of any of these Wikipedia is an excellent resource.

Unit	Name	Detail
W	Watt	Unit of Power
kW	Kilowatt	1000 watts
kWh	Kilowatt hour	Measure of Energy
L	Litre	Measure of Volume

Best Investment table

Measures to reduce fuel bills		ROI*
	Lagging	1
	Loft Insulation	1.9
	Cavity Wall Insulation	2.2
	Underfloor Insulation	4.2
	Solid Wall Insulation	15.1
	Solar Hot Water	34
	Double Glazing	55.6
*ROI is the time it takes in years to return the investment in fuel savings for an average gas heated 3 bed semi-detached house. The table assumes no government incentive schemes are used.

Renewable Energy Measures		ROI**
	Heat Pumps - Replacing Electric	4 to 8
	Heat Pumps - Replacing LPG	15 to 30
	Wind Power	14 to 55
	Solar Photovoltaics	24 to 64
**ROI is the time it takes in years to return the investment in electricity savings. The table assumes no government incentive schemes are used.