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Posted By: jezza22 The point is you dont have to have high water temps with a store!
Posted By: adhHi Sean,I've been in touch with both companies. Danfoss seem to think having separate tanks is more efficient but has the obvious drawback of requiring more space. Nu-Heat are promoting their towel rads being fed from the DHW side but, as others have said, this is very inefficient for a GSHP. From my limited knowledge, keeping the supply temperatures from the GSHP as low as possible maximises the COP. Everytime you raise the temperature for DHW, you are reducing efficiency and it's costing more to run. I think in reflection I'd rather feed the towel rads from the heating side, at 45 degrees, but then boost to working temperature via electric. It's not ideal as you're using more energy but using DHW to provide what is essentially space heating seems a waste.I'm no expert though so don't quote me!! I'm still researching and the links in this thread have provided valuable contacts and reading. It seems that there's a lot to this type of setup and getting the combination right could mean the difference between a very efficient economical setup or the opposite!!
Posted By: jezza22PS My aluminium rads are oversized between 25% and 55% depending on the location but they are so high output they are tiny compared to those they replaced.
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