KBW

We will have a radiator circuit too. Should I put an NRV on the return leg of that to stop the UFH circuits pulling?

Thanks, I’m glad someone agrees with me.

Hi all I’ve been reading various heating related posts on the forum to research our heating system. Does anyone have an opinion on open loops in UFH? Our design hasn’t specified room thermostats in the bathrooms which seems a bit wrong. Sometimes the only room in the house that needs heat is the bathroom so relying on it being heated via an open loop needs something else to be running? I am being a bit dim or do I need to buy more thermostats?

That helps, thanks. I’ll bin the NRVs and put in 3 zone valves. If each manifold has it’s own wiring centre which is linked back to the buffer tank, does it matter if I put them at the manifold end or the buffer end?

Someone must be able to help me out with this please.

Hello We have built a large extension to an early 1900’s house to be heated by ASHP with buffer tank. We are installing a wet UFH system using 3 manifolds due to the position of the zones. We will also have radiators in the bedrooms in the old part of the house. Looking at various heating system designs online, I am confused as to what valves I need to install and where in the pipework. Do I need a zone valve for the radiator circuit and one for the UFH circuit? Or do I need a valve for each manifold? And should the valves be located at the buffer or at the manifolds? I have also seen some circuit drawings with non-return valves on the return legs of the UFH, presumably to stop the other circuits trying to push the wrong way. Any advice greatly appreciated.

I hoped our SAP report would have arrived to answer these questions but still waiting. We will have 100mm K103 Kingspan insulation on the block and beam.

Hi. Thanks for your replies. The house is 2 storey brick with cavity wall insulation. We have demolished the old single storey kitchen and bathroom which leaves a building with footprint of approx 55sq m. It has old double glazing which we plan to replace. We are building an open plan SIP extension - 2 storey with footprint of approx 80sqm. This is block and beam floor and will have UFH throughout. The size of the heat pump is TBC but we are planning on a unvented DHW tank of minimum 300ltrs. We were advised to put in the large bore heat main because of the siting of the ASHP away from the house. Installing mains gas is not an option due to distance from the nearest main.

Hi I really appreciate all the advice and information on this forum so have finally registered with a question of my own. I have bought a house with no heating. We are going to install an ASHP behind an outbuilding and have already put in a heat main (twin 50mm pipes) from the outbuilding to the house, a distance of about 20m. What size pipe should we step this down to for routing through the house to the DHW cylinder and UFH gubbins? Is 28mm big enough? Thanks