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Last Post by cathodeRay 34 minutes ago
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 pipebaron
(@pipebaron)
New Member Member
Joined: 15 hours ago
Posts: 2
13/10/2025 9:54 am  

Thanks @jamespa I will.


This post was modified 3 hours ago by pipebaron

   
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 Batpred
(@batpred)
Trusted Member Member
Joined: 9 months ago
Posts: 37
13/10/2025 12:23 pm  

Posted by: @pipebaron
↑

Long time listener and new to the forum. Currently using a combi but experimenting with low temp heating and looking at ways of improving my system.

 

im currently getting quotes for a heat pump and cylinder installation and very much into the technology now.

Happy to emeet you. We will eventually go the same way, from a combi to a heatpump and so interested in what's forcing everybody to get a cylinder back in for the pumps. We have a cold water pressurized cylinder so the combi can cope with two showers running. Do not like the idea of preventing legionella etc. Will keep an eye for that thread!   

 



   
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cathodeRay
 cathodeRay
(@cathoderay)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2246
13/10/2025 12:38 pm  

Posted by: @batpred
↑

interested in what's forcing everybody to get a cylinder back in for the pumps. We have a cold water pressurized cylinder so the combi can cope with two showers running. Do not like the idea of preventing legionella etc. Will keep an eye for that thread!   

The cylinder is there because heat pumps are 'low and slow' - they can't do bursts of high heat output, so you have to heat the water over a period of time (about 30-40 minutes for my 200L tank), and store it so it is ready for use when needed. It works fine, unless you have exceptionally high hot water use, in which case you might need a larger tank. The DHW tank also needs to be a heat pump compatible one ie have a larger heating coil inside, in just the same way radiators need to be larger.

The legionella cycles are optional. The actual risk in most domestic settings is low, and assuming no other risk factors eg immunocompromised residents, then it is entirely up to you whether you use them or not.


Midea 14kW (for now...) ASHP heating both building and DHW


   
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