Not fitted myself, but have been going back over the installation as originally things like the internal insulation was installed over pipe clips leaving huge gaps, etc. Admittedly gaffer tape probably isn’t considered the best way to join the insulation but I’ve got a lot of it and it does the job better than cable ties. I’ve sorted the weather compensation too as it was originally installed at fixed flow, that made a lot of difference to consumption.
Yes, all radiator house. A heat loss report was done prior to install with recommendations to replace most radiators. I wasn’t ready for that last year so just went for the heat pump install.
Now 9 new radiators are going in with 2 swaps. K2s for K3s and K1s for K2s. Only the hallway and landing is still technically undersized but I will live with that.
28mm primaries with tees off in 15mm dropping to 10mm or straight to 10mm to every radiator (depending on whether it’s the original part of the house or extension).
From the heat pump is 28mm too, with the supply from the buffer also piped in 28mm and joined to the original system under the landing floor. Probably 10m maximum new piping to get to the original.
I know Grant now specify a LLH for their installs but at the time a buffer was an option. Knowing my radiators were undersized I wanted the buffer to minimise cycling of the heat pump and to give the hp something to draw off for defrost rather than cooling the radiators.
Mine doesn’t, only the Mag Filter on the return (supplied with the heat pump) and the same model (that I already had from my existing system) fitted to the return from the radiators.
Ok, understood. It’s the Intatec INFBV2850 rated at 10 - 50l/min that I’m looking at. Purely to get the flow rate after the buffer to compare with flow reported by the heat meter to try and keep both sides balanced as I’ve read this is preferred. The flush and fill but is a nice to have.
If not the Intatec, is there a flow meter that comes recommended?
The information available from the Grant is quite limited, no where near what you can get from a Vaillant. But they were rarer than rocking horse … last year so here I am with the Grant.
I’m not sure I “need” one, but with only using tap water to fill the system with nothing else I thought it was a preventative measure to reduce risk of corrosion further. Maybe I’ve fallen for the sales spiel?!
I’ve seen a few people on Twitter who say this, hence why I thought I’d give it a try.
Thank you.
