Daily Mail


- * COMPILED with assistance from David Haskell, author of heat pump book All Smoke And Mirrors, £12.99.


▪ ENVIRONMEN­TALLY friendly — cost effective if used with solar panels.

▪ LONG-lasting if it is installed properly.

▪ SAFE to run — no open flames, no danger of carbon monoxide poisoning.

▪ CAN contribute to a healthy home as a result of providing a constant controlled humidity and temperatur­e throughout the year.

▪ CAN switch from heating to cooling with the flip of a switch.

▪ GRANTS are available (£6,000 for ground source heat pumps, £5,000 for air source).


▪ DEPENDENT upon expensive electricit­y.

▪ CANNOT compete with convention­al gas boilers for heat output.

▪ WILL often require existing radiators to be replaced with larger ones.

▪ INSULATION — walls and loft — and double glazing are a necessity.

▪ EXPENSIVE to install (between £7,000 and £13,000 for an air source pump, up to £30,000 for a ground source one). This is before grants available under the Boiler Upgrade Scheme.

▪ AIR source pumps can be ugly and noisy. Ground source pumps require a big garden for pipes to be buried under.

▪ MANY houses — terrace homes and flats — are not suitable for air pumps.

▪ GOVERNMENT grants are attracting ‘cowboy’ installers.

▪ THE units require glycol (anti-freeze) to be replaced regularly, otherwise the pumps can get seriously damaged.

▪ WORST of all, they can be less effective in cold temperatur­es — which means supplement­ary heating may be needed.

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