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The boiler needed extra pipework for PDHW because that's how the boiler is designed. I'd have thought it far simpler to put an OpenTherm system boiler in, keep all existing pipework and swap the Y plan for S plan using EPH OT controls to achieve PDHW.

I have used open blades on one job, an assembly unit not even 6 metres and I think they worked, I wasn’t called back (30 plus years ago). Destrat fans were recommended to me, I did a bit of research and went for it. Not cheap, I think £1500 pounds but I can confirm. I could have mounted them...

Vokera Vibe Max Shraeder valve protrudes through the top of boiler accessible from outside case. Vokera Vision Plus, the vessel is inside boiler and the valve is facing user on right side but case front (two screws) needs to be off for access. Vokera Unica Max, removing the case is the same as...

Exposed, I ordered it in a colour. The height is 8 metres. It runs on speed 2 of 5

Destrat fans work. If on Facebook search for a Viessmann group for a referral or call Viessmannn themselves, I know of nobody in the area I'm afraid.

Where are you in the country, there may be people that can be recommended who are fully conversant with Viessmann. You have no underfloor in a church? That's going to be tough to heat with high ceilings. I have a chapel and would not get rid of a perfect parquet floor to lay underfloor which...

It's why I recommended the Oso cylinders which allowed removal of the drop tube so with an external vessel it could be fully flooded. I've learned they've dispensed with the tube a while ago due to the bubble issues.

I suggest stick with Megaflop as it’s the easiest, cheapest option. There seem to be two issues with them, one I haven’t encountered myself, that of the disintegrating baffle. Have you had to replenish the air bubble in the past? If not just fit the replacement. If you have, stick an external...

Thanks, didn't realize that. Poop

The V200 has WC and controls the whole house from outside, has combustion control but no OpenTherm. The 100 has OpenTherm but no Vicare app or combustion control. They both have a stainless single pass large bore hex but with limited residual head. Look for an alternative boiler then that has...

Next webinar covering heat pumps is 19th June 4pm, register on webpage. It's not a comprehensive as he full day course. https://www.vokera.co.uk/trade-professionals/events/

Dare I suggest ringing Margaret on 01727 744002 and book yourself onto Riello's heat pump training course at either London Colney, Herts or Cleckheaton, West Yorks. I run it and I think it's intense but useful. Free, no qualification at the end of a very full day and very little is about...

And onto the efficiency figures achieved at the power station we can add transmission losses shipping the electrons through the cables to the point of use. There are losses in the gas grid of course but far smaller.

Coefficient of performance. SCOP seasonal coefficient of performance. COP of 3.5 would equal 3.5kW heat energy generated for 1kW electrical energy input. The colder the day the less ambient heat in the air to be harvested the COP reduces.

Can a gas boiler? Yes, if the gas is up to spec and there's enough of it. Same with a heat pump, the colder the day, the lower the COP, and that's where design and understanding come into it

If you haven't had training, get some.

One of them

No, only the certified test figures. What's the refrigerant in your annex unit, who is the manufacturer?

The Carrier Aquasnap 290 can hit 75 degrees but like all heat pumps keep it as low as possible. Insulate, carry out an accurate heat loss then decide.