M
Martinplumber
Hi,I am doing a large new instalation of a ground source heat pump with underfloor heating to three floors having 7 large manifolds, plus hot water etc.My question is about the hot water side. As I have mentioned this is a large property and it is thought having a electric pumped hot water loop with two 300 litre hot water tanks next to the heat pump and buffer tank is the best method of delivery the hot water to the nine bathrooms, wc's kitchen, utility room etc., But I can't get my mind around thinking how having a permanent pumping of the hot water is not a very green idea and what of the balancing of the hot water pressure with that of the cold water to all the showers etc? I am open to this method but presently my preference is to have three water water tanks in their best positions which can supply all of the water within a suitable distance and keep the water pressure balanced throughout, although saying this there are two water mains to this property. This however I would have thought not present a problem as long as they can both be turned on/off together and with suitable notices and making this aware to the owners and having check valves installed on each main by the stop cocks? The considerable pipe-work loop to the the underfloor heating manifolds which starts with some length of pipe having a 50mm bore then reducing en-route down to 22mm at the furthest distance manifold valves. this loop could be altered to allow heating of the hot water tanks coils with suitable valve controls albeit having higher heat pump water temperature, and thereby also saving much extra pipe work?The other thing is there is a two phase electric supply to the property. One having a 3.84kw of PV panels on one phase and the other having a cheaper off peak supply to mainly the heat pump and hot water tank immersion heater top up for use in the early hours of the morning.I should be glad of any input or thoughts from any interested person?Many thanksMartin