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Heating DHW in stages

 
Domestic Hot Water & Cylinders
Last Post by ASHP-BOBBA 21 minutes ago
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 Singlespeed
(@singlespeed)
New Member Member
Joined: 2 months ago
Posts: 3
Topic starter 25/05/2026 8:35 am   [#3017]

As heatpump efficiency drops at higher temperature, is there any merit in running two or more HW schedules back to back with increasing temperatures.

Rather than a 52°, use 35° followed by 45° and finally 52°

Do modern heatpumps already heat the water automatically in this manner, or just whack output temp straight up to the required temp

I guess stop starts would negate any gain. However if the first schedule would normally complete after 50 minutes, simply set the second schedule to start around the 40 to 45 minute mark...

 

 



   
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 ASHP-BOBBA
(@ashp-bobba)
Honorable Member Member Professional Installer
Joined: 1 year ago
Posts: 458
25/05/2026 9:45 am  

Posted by: @singlespeed
↑

As heatpump efficiency drops at higher temperature, is there any merit in running two or more HW schedules back to back with increasing temperatures.

Rather than a 52°, use 35° followed by 45° and finally 52°

Do modern heatpumps already heat the water automatically in this manner, or just whack output temp straight up to the required temp

I guess stop starts would negate any gain. However if the first schedule would normally complete after 50 minutes, simply set the second schedule to start around the 40 to 45 minute mark...

 

 

I would imagine this would have minimal effect and runs the risk of short cycling the compressor if you stack them to close by the over shoot in the time frame. The systems just chase a DT, they look like they blast the system because they are chasing that DT, if the heat exchange is high they will drive harder, if its low they will drive lower. 

I also would like to think, if this had real benefits it would have been programmed in to one of the manufacturer software designs by now and they would be bragging about it.

 


AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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