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Yea thats something I'm thinking off, wanted them to see the cable connection in the control all the way to the valves, but its not critical that they do. It'll be fixed on a board so easy enough to hide cables behind etc.

Wandering if there is any cable available like this that works on 230Vac. Asking as I'd like to make up a control display if possible, where when a controller sends power out to a 230V valve motor, the cable lights up to indicate visually where the power is coming from and going. It would...

Generally for heat pumps they ask for Strainers rather than magnetic filters. Both is best. And yes would go on the primary return to the heat pump to protect the condenser.

Hi all. Type B RCDs are rated for high frequency upto 1kHz, in Germany they have a B+ which is higher tripping current upto 20kHz, is there an equivalent British standard for better than normal B-Type RCDs? i.e if you need a 30ma B-type RCD rated upto 20kHz that has min tripping...

ambisense isn't compatable with the apps and being discontinued as a product. I don't see much benifit personally to using individual room control when your using a weather compensated controller, if your appliance only puts the heat into the house you need then TRVs typically take a back seat...

Looking at it the reverse return is just for even flow through both coils. Where it enters the cylinder one pipe goes straight and other elbows off, so most flow would go straight. So at the bottom the higher flow coil has an elbow and visa versa, to even out the resistance and flow

But the mass of water in a given volume changes dependant on temeprature. Which is why l/s is technically wrong for mass flow rate. Although for the purpose of domestic heating calcs I'm also very guilty of interchanging them

Bigger surface area and bore coil the better, but I'd not be paying significant amounts extra for it. Im not sure in denmark if the aroTHERM plus is badged the same as here i.e. 7kW @ -7degrees outside 35 flow, or whether they are badged like the European Norm of 7kW at +7degrees outside and...

There not standard. Well, they are to the UK, The UK does everything weird compared to the rest of europe. The Vaillant system doesn't need them as it's telling the valves what to do, traditional UK system the valves tell the boiler what to do.

1 question. What output of heat pump would you be using?

If their chapping doors offering it for free then its normally a scam or a company set up to squeeze the life out of govt funding (i.e. not giving a $hit if any of it works, just slinging it in to claim the grant money and there gone) Heat pumps work fine in old houses, its a source of heat, as...

Thats a shame, a Vaillant fitter would get you 10 years warranty on boiler and the controls if they supplied them. Depends what you want. The 415 will modulate down a little bit more that the 418 (only about 300-500Watts in it), which means it will cycle on and off a little bit less. However...

Turn heating on for upstairs and leave it till it starts making the noise. Then go to an upstairs radiator and turn the TRV right down, if noise continues, open it back up and move to the next radiator and try again, any radiator with a TRV fitted could be causing it. If there are raidators...

Sounds like one or more of your thermostatic radiator valves is fitted back to front. Next time it happens go round the radiators and turn the TRV all the way shut and all the way open, if it stops when adjusting one you've found your issue.

When you rechecked it was the boiler pressure at zero or did you still have water pressure in the boiler? Can only check EV accurately when system pressure has been dropped out

The technology for air source has improved, however basic physics has not. To run a heat pump at similar or lower cost than a gas boiler in the U.K you need to design a heating system that will work at low temperatures. i.e. when its -3 outside I only need my radiators to be 40 degrees in...

R290 is just propane. We have bulk stores of propane outside thousands of houses as it is now in the UK. The amount of propane (R290) in a domestic heat pump is tiny. Where some of the difference will be is that in the UK a majority of domestic "heat pumps" are monoblock systems so the...

No. Its locked in the software. If the boilers in the garage or loft then there is every chance the boiler will run for periods over night when it is very cold.

Doesn't matter how many people write articles saying you must, the regulation doesn't say that. Aside from bedrooms, TRVs on a heat pump are like pressing the accelerator on a car all the way down and using the breaks to adjust speed rather than simply lifting off the accelerator.

"SSchedule 1 – Part L Conservation of fuel and power L1. Reasonable provision shall be made for the conservation of fuel and power in buildings by— (a) limiting heat gains and losses— (i) through thermal elements and other parts of the building fabric; and (ii) from pipes, ducts and vessels...