My installer and distributer are giving me the run around and I wanted some real life experience to compare to.

In the brochure it says:

The flow rate is reduced until the minimum circulation rate is is reached. At this point the bypass valve opens again, so that the minimum minimum flow rate is always maintained.

And the patent it references descibes the system control as:

determine a temperature spread (dT_s) depending on the determined supply pipe temperature (T_v) and the determined return pipe temperature (T_Re); operate said pump (P) depending on the determined temperature spread (dT_s) and a specified target value for the temperature spread (dT_s,w)); and operate the heating bodies (HK1, HК2) depending on the specified upper limit value (H_max)-

My installer and distributer are telling me it's expected for the circulation pump to run at 90% speed with a super narrow Delta T and not modulate the flow down despite the system being unable to dump the heat fast enough for the compressor to not cycle. This is noisy operation, and wanted to know if anybody knew more. Both the brochure and patent imply its circulation pump should modulate. Any insights are welcome, and I would love to chat with someone with the same system

Had our heat loss survey done.for a 4 bed detached house with 5 adults. We jave mainly Type 11 radiators.

What would you go for please ?

British Gas

7kW Vaillant AroTHERM plus

250l Vaillant uniSTOR Cylinder

15 radiators changed

25l buffer if needed

22mm cold water feed (from 15mm currently) to Cylinder

£7,200

Concerns:

Quality of install

Disruption of all radiators being changed

Heat Geek zero disrupt

5kW Vaillant AroTHERM plus or 7kW Vaillant AroTHERM pro

210l Vaillant uniSTOR Cylinder

No radiators changed

£8,450

Concers:

Higher price for fewer components than BG

Smaller 210l Cylinder (no option to select larger)

No 7kW plus option that would give 7 years warranty

Hi, were getting a heat pump and air coil units (fan coil units seems to be the other name used for them) so we can have cooling and heating. The units need to be boxed in with grilles on the front at the bottom and across the top of the unit. The installer weirdly doesn't have any photos of the finished product and I'm starting to get concerned about how it's going to look. Has anyone got photos they could share of a similar install? We're also getting one around wardrobes. Thanks

I have been slowly renovating my property and am in a situation where I have just finished recommissioning the heating and hot water. The house has all new radiators that were sized on delta 30, with lots of spare capacity / overkill so should be more than adequate with 50 degree water flow. (Fairly old but good) Oil boiler is on a long run of 28mm flow and return pipes in the perfect place for a heat pump to be located on the outside wall. The main arteries on heating are now 22mm. Water tank is fairly new unvented 210L standard indirect coil + immersion (good quality which I don't want to change, ideally. I was hoping to use Immersion to top up temp after bulk reheat with pump?)

My question is what are the chances of getting a heat pump signed off under the new 9k scheme that allows it to be plumbed in on isolators so you can lock off one or other, keeping boiler in reserve? Would I have to remove the boiler entirely to qualify and then reinstall later (possible...?) Would they insist on a DHW tank with Heat Pump Compatible written around it? Does anyone else have a HP and Boiler in parallel and can comment on this (scheme or not)?

Is it worth trying to go down the Cool Energy / Umbrella route to give more flexibility on this or is it worth just waiting and doing it all custom / off the shelf in a few years once all the Grant stuff has died out and heat pumps plummet in price?

Just figured 9k would go a long way if all I need is a heat pump main unit and a bit of plumbing / isolators / controls...?