Jonnyc

Hi All, Thanks for all this wonderful help. I had a feeling I would be able to rely on you all. So maybe a little more detail might help. But I think I'm going to be fine which is very reassuring!! The bath in question is a timber bath we have made from Douglas FIr. You can see it in the foreground of the attached pic (assuming I manage to attach it) internally it measures 1670x700x390 but it has some space saving blocks inside so the total volume is 390 lites .. Assuming a person of say 75 kilos- and possibly a second one of a similar size means the Total volume comes down to around 240-300 litres per bath. As long as the water is actually hot - is 55% unreasonable ? - then we should get away with only needing about 200 litres of hot water at a time. The bath is designed, to overflow onto the floor where it drains away so creating a sort of infinity edge. We're assuming therefore it will generally need all that water. The treehouse is a commercial holiday let aimed at couples so I don't think anyone will need the bath again super fast. There are also other showers and it will actually accommodate up to 4- 5 people. So on balance they might run out once in a while but I think we're almost there... I guess the next thing is to choose a ASHP unit. But I have no idea on that... do I just plump for a 5kw affordable HP and a heat pump cylinder and allow the guys at REDD to work it all out for me? (or is that a really stupid question?) Or should I just go up one size to make sure??? Many thanks for all you patience!!

Newby here... We're building a treehouse - but one with a ground floor. It's all insulated heavily and airtight with a MVHR so plan is not to put a lot of heating in it. But we do have a very large bath. So are thinking of using an ASHP to heat one UFH heating panel (about 15m2) using 12mm pipes and then a large (300l) water tank to provide the hot water. So just looking for thoughts on sizing of the heat pump. Was hoping to get away with 5kw but I'm pretty certain someone is going to tell me that's not enough!! The unit needs to have a cooling phase as we are using a new Zhender MVHR with has a cooling loop. Does anything spring to mind anyone?? is there a perfect ASHP/ cylinder combo? Many thanks.

Hi there. We're building a passivhaus or - high performance if you prefer the term - treehouse. Triple glazed, insulated with straw, airtight with a Zhender MVHR. Busy little project. Taken a lot longer than we planned!!!