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Heat pump cylinder without the heat pump...


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Recently I was given a 14kw heat pump and associated cylinder. Now, we're putting up an outbuilding, it's 100sqm with walls at 0.1 and ceilings at 0.11 (sips build with superfoil). Obviously, the heat pump is going to be massive overkill to provide heating and DHW. However, I was wondering if anyone has just used the CYLINDER from a heat pump as an immersion heater for the DHW without connecting up the heat pump? It'd save me buying a new immersion heater at £1500, and I like the idea of using something I already have if at all possible. Any thoughts on whether this is possible? The heat pump is the puhz-hw140vha2 and the cylinder is ehpt25x-ukhcw. Any thoughts or ideas would be hugely welcome 

 

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2 minutes ago, Antonb182 said:

wondering if anyone has just used the CYLINDER from a heat pump as an immersion heater for the DHW without connecting up the heat pump?

Basically nothing wrong with that. Have heated mine a few times just via the immersion.

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you say "It'd save me buying a new immersion heater at £1500" - sounds like you are asking if you could use the heat pump only for heating hot water "without connecting up the heat pump" (to the rads/UFH?). Sorry if misunderstood.

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But a 100 square metre building will need some heating, unless you never plan to use it in the winter.  So why not use the heat pump you have?  What else are you going to use?

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1 minute ago, ProDave said:

But a 100 square metre building will need some heating, unless you never plan to use it in the winter.  So why not use the heat pump you have?  What else are you going to use?

Just do UFH throughout in a thick screed, then you have 20 to 30T of concrete to buffer against and batch charge the floor for a few hours a day. Big heat pumps also usually have a good turndown ratio.

 

Only thing to watch is you have enough flow rate, so add a 2 port buffer and secondary pump as per drawing. 

 

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