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Hi, hope you can help. I had a Viessmann 200 boiler installed a couple of years back, with weather compensation and modulating pump. I've been really happy with it and the weather comp works well. I've been renovating the house since then, room by room, replacing the old radiators with...

Without the weather comp, it's just like any other boiler - heats water to a pre-determined set point. If you are not using the weather comp then you miss out on one of it's key points - very low burner output when modulating to meet heat load. This helps with maintaining flow temp and helps...

Had this type of system installed in my house January 2012 (19kW boiler, weather comp, modulating pump, 210liter DHW tank) and I'm very pleased with it. Make sure you get larger than normal rads (larger heat emitting area) and make sure your home insulation is up to spec to get the most out...

Looks like I've found the source of the problem! I've been wall-papering the ceiling of our main bathroom this morning and during preparation I removed the ceiling light. When I removed it I found that two earth connections were connected to the light fitting, with a third tucked back up in...

Thanks for the suggestion regarding the mains sockets, it's something that needs serious consideration. I have one of those testers, and *think* I've tested the sockets in this house, but will dig it out and check the sockets to be on the safe side. Also have one of those plugs with an external...

Hi Gents, Thanks for the responses, they are very much appreciated. As a bit of further information, I turned off the lighting circuit at the MCB and rechecked the voltage across the two light switches. This is now down to 1.3Vac. When I turn the lighting mcb back on, the voltage increases...

When you say isolate, do you mean tripping the MCB for the lighting or disconnecting the wiring in the consumer unit?

Just gone to turn the lights off in my living room, and at the same time turn on the upstairs landing lights - you can touch both easily. I felt a 'tingle' when doing the above, but only when touching the retaining screw of the living room lights (the only exposed metal on this switch, back...

Thanks for the tip on the room sensing. I've had a good look through the codings in the service manual, and as you say, there are settings for room influence on the weather compensation. It also appears that the control can be set for weather comp with room influence during the day, and room...

A nice description of the heating aspect (heat balance) of my day job, although I tend to spec heating systems and controls on a larger scale than my house! In our old house, I had a Vaillant ecotec 824 installed, but used to manually adjust the flow temp to the rads depending on the season...

The installer did not get the chance to clarify how the system works, as Viessmann had to come and sort the boiler out as it died half-way through commissioning! It appeared to have been built with a friday-afternoon fan unit, which died, taking out the main pcb. This at 5pm as well. Still...

Thanks for the clarification, shame they did not go for room influence on top of the weather compensation as well! I checked the status of the system during the setback periods, and it states that the pump (and burner) is off. I'm not massively concerned, but I was under the impression...

Evening, I've recently had a new boiler (19kW Viessmann 200W)and DHW tank (Vitocell 150) installed, to replace the old boiler. I decided to also go with weather compensation (Vitotronic 200 HO1B controller) and the fully modulating pump. I'm really pleased with it, keeping the house warm...