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Last Post by bontwoody 2 years ago
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 bretix
(@bretix)
Estimable Member Member
604 kWhs
Joined: 2 years ago
Posts: 79
Topic starter 10/06/2023 8:52 pm  

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
5014 kWhs
Joined: 3 years ago
Posts: 741
12/06/2023 11:44 am  

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-2 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
604 kWhs
Joined: 2 years ago
Posts: 79
Topic starter 12/06/2023 12:08 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)
Reputable Member Member
1085 kWhs
Joined: 2 years ago
Posts: 124
12/06/2023 1:53 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
5014 kWhs
Joined: 3 years ago
Posts: 741
12/06/2023 3:52 pm  

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

House-2 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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