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Heat-pump water heaters Updated: 12 May 2009

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water heating refrigerators Posted by: Harping Bowker 23 Jul 2009 8:33pm

Refrigerators, freezers, (& heat pumps in cooling mode) produce heat, can that heat be used to heat the hot water cylinder?

Why not a fridge freezer linked to a hot water supply?

Should external heat pump units be south facing in the summer (when cooling) and northfacing in winter (when heating)?

Timers Posted by: Stetsun 17 Jul 2009 9:08pm

Provided a suitably sized hot water cylinder and Hot Water heat pump are used a considerable efficiency gain could be made by only running the heat pump at the warmest time of the day. Are the heat pumps tested fitted with such timers?

Reply 1: Posted by: ADL Raymond D 29 Sep 2010 9:56pm

Easy enough for an electrician to fit one for you

More detailed results would be useful Posted by: Eric 11 Jun 2009 6:40pm

This is an interesting item. However, it would be so much more useful if the data from which your conclusions/ results were drawn made available. e.g. what output is available from each unit at a range of temperatures ant he efficiency at that point. I realise that this is more information than is required by many, but the web site could have a page to provide more technical information.

Other uses Posted by: rayda 09 Jun 2009 12:02am

A great article. I presume this could, with suitable tempering valves for the cylinder output, be used for home radiator-based heating, which seems a missed opportunity so far by both water heatpump and solar panel suppliers? I recognise radiators are an added cost but they are far less intrusive than the usual split sytem heat pump solution. Are you aware of anyone supplying such? cheers Doug

Comparison with Gas Hot water heating Posted by: Gregory & Karen Scott 08 Jun 2009 8:45pm

How does the energy savings of Heat Pump hot water heating compare with instant Gas Hot water heating.

With Gas, you do not require a hot water cylinder.

Who supplies Econergy HP4000 LT? Posted by: Thomas S 08 Jun 2009 3:28pm

You would probably be impartial enough if you had links to manufacturer/suppliers since e.g. there is no result for Econergy HP4000 LT when searching on line. Cheers Tom