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Update June 2025 It’s all signed up and ready to go, we have a new large radiator in the hallway to give additional volume and flow, the slab is done for the outside unit to be fitted, and the contractor is booked in to install a 5kw ASHP in mid July. I’ll report back when it’s fitted and we have so...

Sounds good. The slab takes a lot of energy to heat it up, but then it takes a long time to cool down - this is going to provide a challenge for optimisation but I'll worry about that when the time comes. With such a long time constant, as long as/to the extent that the loss is only 1/3 of the capa...

OP reporting back. ... The heat pump will be connected to the existing thermal store where it will heat the stored water which in turn heats the DHW via very large coil. So you are planning to keep the whole TS at 45C (or more depending on yr view of Legionnaires' disease risk)? Presumably this wil...

OP reporting back. We have had discussions with three potential suppliers, all of them confirmed that we are entitled to the government subsidy. We have selected one of them and the process has started. The plan is to install a Vaillant 5KW machine, it will be connected to the existing UFH manifold ...

R290 HPs don’t seem to lose power output in low temps compared with R32. Hard to know for sure, not seen real world data, just looking at manufacturer figures. I wouldn’t recommend running the HP hard for space heating unless you have UFH beneath a 200mm slab. Comfort levels will be poor due to the...

Indeed, I am conscious of the advantages of running 24/7, but it will probably boil down to the economics, if it's much cheaper to spank heat into the house for a short period during low electricity prices then that's probably what I will do. I am hoping that I can manipulate the flow to around 8+ ...

R290 HPs don’t seem to lose power output in low temps compared with R32. Hard to know for sure, not seen real world data, just looking at manufacturer figures. I wouldn’t recommend running the HP hard for space heating unless you have UFH beneath a 200mm slab. Comfort levels will be poor due to the...

Indeed, I am conscious of the advantages of running 24/7, but it will probably boil down to the economics, if it's much cheaper to spank heat into the house for a short period during low electricity prices then that's probably what I will do. I haven't even started down this road yet, but isn't tha...

Indeed, I am conscious of the advantages of running 24/7, but it will probably boil down to the economics, if it's much cheaper to spank heat into the house for a short period during low electricity prices then that's probably what I will do. I am hoping that I can manipulate the flow to around 8+ l...

I am the OP updating things. Having spoken to a couple of suppliers it looks very much that I will be able to claim the Boiler Upgrade Grant. I have been doing a bit of experimenting with my UFH manifold and it looks like there is a complication with my requirements. If the proposed ASHP were to be ...