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Air Source Heat Pumps (ASHPs)
Last Post by GordonEngland 2 years ago
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 GordonEngland
(@gordonengland)
Active Member Member
Joined: 2 years ago
Posts: 5
07/10/2023 3:57 pm  

@allyfish Thanks for posting this . Your situation is very comparable to mine her just north of the Border in Berwickshire.

wanting to move from our Grant condensing oil boiler to a Vaillant or new Octopus Cosy 6 HT ASHP. Encouraged by the £9k grant we get here!  Already on 4KW PV backed by  a 9.5kwh GE battery. As an experiment I bought a 2nd Sunamp 10kwh heat battery early in Summer to divert the spare solar  Fantastic ! , saved 500 litres of oil used for summer water heating. Want now to get a Sunamp that can twin with a HT heat pump and be charged thermally as well as by electricity/solar. Hoping to avoid rad changes as far as poss. We are on EPC C despite it being a whinstone built house 600mm thick! With no wall or floor insulation but DG and loft Ins. South facing though. Thanks for your helpful info!

bill



   
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 GordonEngland
(@gordonengland)
Active Member Member
Joined: 2 years ago
Posts: 5
07/10/2023 8:03 pm  

@allyfish Can I ask how large is your PV array and the battery size. Do you charge the battery(s) in both Cosy  time periods?

lastly roughly how kWh does your  HP draw per hour over the 17 hours?

 

I have  a 137 Sq m  stone end terraced ,3 beds house with 14 rads was using 1200-1500 l of oil ,but cut to perhaps 800 due to the Sunamp.

busy speccing & costing a HT HP 6 - 7 kw solution with a 10kwh Sunamp and an appropriate tariff regime. Thinking 22 - 24 kWh of peak grid via Cosy & 9.5 kWh battery( charged in both periods) might yield similar results to yours. Need another 5kwh just for household use . HP not needed in warmer months at all perhaps as we had free hit water and electricity May to August.

 

Bill G



   
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