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My son has an unvented hot water system installed in his new build house. We know very little about it. We want to fit a water softener immediately after the cold tap in the kitchen, but not sure how to isolate the upstairs cylinder to allow the softener to be plumbed in series with the mains...

Hi all. I have a Vaillant 418 ECO tech plus boiler with VRT360f and Vr65 running into an open vent system (S Plan) Now that the outside temperature is becoming warmer, I find that boiler is cycling quite often. Have now found that setting 'd0' alows boiler to be set at a lower 'part load'...

Operation of the VRT360 and VRT360f Controllers with ecoTEC plus Boilers. I have realized from correspondence here and elsewhere that operation and limitations of the Vaillant VRT360/360f controllers, when used in conjunction with the VR65 interface, a cylinder thermostat or VR10 Negative...

This question centers around setting 'D70' on this boiler, which should give either DHW priority when set at '0' or allow CH and DHW to operate together when set at '1'. However, it does not seem to have any effect, as DHW has priority at either setting. Copied below is an edited copy of an...

Last year, I had an open vent Vaillant 415 Eco tech plus boiler fitted by a Corgi fitter. I had, prior to fitting, upgraded the system electrics for my old boiler, using a Horstmann 425 mechanical programmer and Drayton Digistat RF1 room thermostat. An existing pair of five wire, 2-port, zone...