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Thanks Harry, with a classic junction box there is a cable going from the 230v RT block on the boiler PCB to the junction box and controls near the valves and cylinder (say an airing cupboard). With a wiring centre it's different, there is the ebus going from the PCB on the boiler to the wiring...

Thanks Both, This is for a Vaillant Ecotech 637 plus, unvented external cyl, two MRVs and the grundfos. When setup in relay mode with a classic junction box the grundfos gets to operate when told to do so by the programmer. With a Vaillant wiring centre there is no block for external grundfos...

Hi All S-Plan with two MRVs (CH and DHW). Valves are controlled by a Vaillant wiring centre. When calling for CH the CH valve opens and boiler fires, all good. How do you connect a CH water pump (type grundfos) to this wiring centre? It has a live neutral and earth but if all connected to 230v...

Hi Bionic-Arm, looking to do exactly the same thing here: S-plan 2 valves, same boiler, same internet gateway, same thermostat, same wiring centre (!!!) Do you use the myVaillant app and are you happy with it? It looks good on the Vaillant videos but the PlayStore app reviews are scary (failed...

Hi All, I have a Vaillant ecoTEC 637 plus, likely fitted ~2017 mounted as a system boiler, single zone, with a separate water tank for DHW. The thermostat is a Salus RT500 wired via the 230v RT connection. There is also a Drayton scheduler. (Small parenthesis: It is also a classic case of...

Hi All Vaillant ecotech system installation (+ tank for Domestic Hot Water), single zone. Current thermostat is a wireless salus, with a drayton programmer. Myvaillant connect will be installed to program heating times via phone app, directly on ebus connection so no wiring headache for this...

Hi All Cellar of Midterrace Victorian (likely 1905 ish), not used for anything at all (currently empty) other than hosting the electric board and meter. We're having the front repointed, should we seize the opportunity to repoint the cellar too? One guy said he could render + put insulation, I...

Boiler size: Thanks for pointing that out! It's a 2000sqft terraced, 5 beds 3 baths and there were 5 renters before. What is the implication of having 37 kw? Is there a risk of overconsuming energy? If that's the case I would definitely consider downsizing the boiler. Thermostat: Currently...

Hi All New house, new boiler! The set-up is: - Vaillant Ecotec Plus 637, system boiler single plan - Tank elson zircon 250zi, no immersion - Programmer Drayton LP722 (dual channel, heating and hot water) - A Salus controller, not too sure what does is used for. As you can see from the PCB...