MikeSharp01

I like that you have Ned Kelly wearing his metal head gear working there in the middle with the green high viz.

Metric.

The thread on gauge does not appear to be standard, 1/8th BSP vent does not fit, I will talk to the suppliers and get a new end cap assembly as the flow head.

Sadly that would require a complete redesign and there are loads of other pipes - mains water, water softener etc, running in those areas I have not installed yet so two filters is easier. I have the connections for that coming Monday to the far left of the straight run from the return manifold That's already in the return line from the tank out of shot to the left. Its not 25l though it 8l which should more than cover the 70l of the system I worked out.

Here is the plant room mockup plumbing (used 28mm plastic segments to get lengths right and check scheme). I think I can get the filters into the utility room as indicated, I either do away with the fill flush or put it outside by the HP and work hard to insulate it.

I will send some pictures in the morning.

I think I have a full flow filter. It's this one:

So I am going to have house them both outside.

Thinking about it I cannot put the valve inside either as it would have to be in one side or the other of the system.

Does that mean the stainer has to be inside as I have nowhere to put it inside. Pipework splits as it comes through the wall.

Your budget is not unrealistic for 80m2 and if you are into it for the long term you can do a lot of the work yourself and pay for it as you work. The up front lump will be your plot cost!

Thanks, how do you put inhibitor etc in, no Glycol. We are but the manifold went in before we chose to go that way, only three loops no independent control of the loops other than by the flow meters which once set are left. That is what I thought.

Radical Thinking - but maybe where we are heading. Our children, in their 30s, will defo not retire before 70!

Making progress we are but have a couple of questions. Can we install the fill / flush valve: outside by the heat pump, much easier to get at if we can, just needs good insulation around it and I guess I will still need a filling loop inside to pressurise the cicuit. Each of the UFH loops have a control valve at the bottom and flow meter at the top which way do the control valves work, unscrew to open or screw down to open. The rep from the company did not know but their technical guy has yet to get back to me, thought there is bound to be an expert here somewhere. Do I need Non return valves (NRVs) in the return circuits, UFH and Cylinder, before they re-join to go back to the Heat Pump, I can't see why I would but I saw somewhere doing it.

Welcome to THE forum for people like us. Well 3k per M2 is not a bad figure, so yes. On question 2 I have no idea.