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Heat pump domestic hot water.

 
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Air Source Heat Pumps (ASHPs)
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 David999
(@david999)
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Joined: 2 years ago
Posts: 347
Topic starter 23/09/2024 7:47 pm   [#1719]

Quiet on here so thought I would jump on. What is your consumption when heating domestic water, mine is 5.2kw at the min. 16kw  pump.



   
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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 562
23/09/2024 8:36 pm  

210L 2 heats to 50 degs today, total used 2.6kW. if it heats once 1.4kW



   
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 David999
(@david999)
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Topic starter 23/09/2024 8:44 pm  

@johnmo I guess it depends on how much water I use whilst I’m splashing about like a bear.  But it fair heats it up quick. This year will be the year to test it all out properly.



   
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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 562
23/09/2024 10:06 pm  

@david999 you need to include some specifics, your figure could heat up a thimble or a lake, pretty meaningless really.

Posted by: @david999
↑

5.2kw

That is a heating power, but I assume you mean 5.2kWh?



   
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 David999
(@david999)
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Topic starter 23/09/2024 10:18 pm  

@johnmo yup exactly, you are correct, no idea how that could be done and I was just wanting a ball park figure.  When the heat pump kicks in after a shower it registers 5.2kwh on my app, and was curious what other folks did.  Not how much or how long it ran just what it uses as it’s running in anger.  Hope that makes sense now.



   
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 Steve D
(@steve81uk)
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Joined: 3 years ago
Posts: 11
24/09/2024 7:49 am  

Over the last 6 days we've done 8 re-heats up to 42degC on our 300l cylinder.

Total energy consumed: 13.853kWh [1.732kWh per re-heat]
Total heat energy output: 70.147kWh [8.768kWh per re-heat]

Average power consumption: 831W

Average heat power output: 4.209kW

image

 



   
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Mars
 Mars
(@editor)
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Joined: 5 years ago
Posts: 4727
24/09/2024 10:23 am  

Posted by: @david999
↑

Quiet on here so thought I would jump on. What is your consumption when heating domestic water, mine is 5.2kw at the min. 16kw  pump.

We’ve got a 16kW unit as well, and we’re seeing similar results to yours at around 5.5kWh for hot water at the moment.

 


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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 562
24/09/2024 10:48 am  

Posted by: @editor
↑

Posted by: @david999
↑

Quiet on here so thought I would jump on. What is your consumption when heating domestic water, mine is 5.2kw at the min. 16kw  pump.

We’ve got a 16kW unit as well, and we’re seeing similar results to yours at around 5.5kWh for hot water at the moment.

 

Seen similar mentioned for big Vaillant units. I would consider doing a comparison trial just heating with the immersion and compare. Also double check against the electric meter, to check what you see is real.

 



   
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 David999
(@david999)
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Topic starter 24/09/2024 12:40 pm  

I thought it needed the immerser to heat the water up to 55c but it seems to be doing it all through the heat pump, which surprised me.  I have my flow set at 35c and see how it fairs through winter, I’m happy with a home temp of 19-20 so might lower the flow temp a bit yet.  



   
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 David999
(@david999)
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Topic starter 24/09/2024 12:43 pm  

@editor thats great, I guess it will require a winter run before I gain confidence in my system. It really was a train wreck last year.



   
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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 562
24/09/2024 1:06 pm  

Posted by: @david999
↑

thought it needed the immerser to heat the water up to 55c but it seems to be doing it all through the heat pump,

Possibly why you use so much electric, likely the heat pump is starting the immersion as it's not capable of getting there on its own. Turn the demand temperature down for DHW to 50 or below.

Looks like you need to step back a little to get the system set up correctly - otherwise you may need deep pockets to lay for the bills.

Posted by: @david999
↑

have my flow set at 35c

so not running weather compensation?

 



   
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 David999
(@david999)
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Joined: 2 years ago
Posts: 347
Topic starter 24/09/2024 2:44 pm  

@johnmo not bad at the minute, 2 quid a day for electricity.



   
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