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Electric water heater

 
Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 3 years ago
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 bretix
(@bretix)
Estimable Member Member
Joined: 3 years ago
Posts: 85
Topic starter 10/06/2023 9:52 pm   [#995]

Would it be more economical to run a electric water heater in addition to an installed heat pump, but changing that to solely run the heating circulation.❓


2 10kw Grant Aerona3
Heat loss calc 16.5 kw @ -2.8 degrees
4.32 PV


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1009
12/06/2023 12:44 pm  

Hi, im not quite sure that I understand what you are asking, but an electric heater will have close to 100% efficiency whereas a heat pump will have several times that efficiency depending on the temperature to which the water is heated and the outside temperature. Hope that helps


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 bretix
(@bretix)
Estimable Member Member
Joined: 3 years ago
Posts: 85
Topic starter 12/06/2023 1:08 pm  

Sorry I was probably being vague but I was thinking out loud along the lines of something like this. I guess it was knee jerk to thinking I could run two heating systems (think I'd had a beer at the time so wasn't thinking!) 1. Just for hot water  and 2. For heating alone as the heat pump won't deliver heat whilst it's heating the water. I think I've answered the question myself by just getting a solar diverter.

I've put the articles on anyway just out of interest, although again it probably more orientated to Australia!

https://www.herschel-infrared.co.uk/hot-water-heating/

In relation to this article where they are saying electric water heaters may be better at storing energy versus a battery used to heat the water in a cylinder. 

https://www.popularmechanics.com/science/green-tech/a44108982/electric-water-heater-can-store-energy-better-than-tesla-powerwall/


2 10kw Grant Aerona3
Heat loss calc 16.5 kw @ -2.8 degrees
4.32 PV


   
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 Fazel
(@fazel)
Estimable Member Member
Joined: 3 years ago
Posts: 124
12/06/2023 2:53 pm  

Your HP should be able to provide hot water in between heating the house, a HP heated house should have a back-up electric water heater anyway.



   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1009
12/06/2023 4:52 pm  

@bretix I think they are essentially saying that renewable energy can be stored as heat in a water tank! Stop the press 😀 


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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