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Solar panels on side of house to heat water

 
Solar Photovoltaic (PV)
Last Post by colinc 1 hour ago
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 paultheheating
(@paultheheating)
Active Member Member
Joined: 1 week ago
Posts: 9
Topic starter 10/11/2025 9:42 am  

One side of our house gets lots of sun and was thinking of having solar panels on the sde wall mounted vertically, then sending generated energy straight to our hot water tank via an imersion heater.

The concept is to raise the water temperature as much as panels can and then use normal gas boiler to to the rest.

Is anyone out there doing something similar? And if so what equipment would I need?  

 



   
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 colinc
(@colinc)
Eminent Member Member
Joined: 1 month ago
Posts: 14
10/11/2025 10:17 am  

Posted by: @paultheheating
↑

One side of our house gets lots of sun

Depends upon several considerations; in no particular order:

  • Actual wall orientation
  • Water heater rating / capacity
  • PV array total Watts peak, one RoT is estimate effociency between 20% - 85%, which is very much dependent upon  weather and seasonality.
  • Battery kWh if that is applicable, again efficiency is seasonal, albeit to a much lesser variance regarding ambient temperature.
  • Do your own due diligence on equipment:  headline numbers are not always aligned with reality.
  • Permitted development rights by your Local Council Planning Officer.
  • Shading caused by trees or buildings
  • Physical protection from potential accidental damage
  • Choose your installer carefully,  caveat emptor.

This list is an uncomptehensive "brain dump", no doubt I will have missed things that hopefully others will point out.

Plenty of good stuff on Youtube, and personally I have found "Gary Does Solar" channel a very informative and helpful  resource.


This post was modified 1 hour ago by colinc

   
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