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Nope, i have opentherm on Viessmann 100 combi, it is not on/off once room where thermstat apprached user desired temp then controller (in my case evohome) will instruct lower flow temp from boiler which cause boiler to modulate down burner output , when set point reached min modulation is 8% fir...

The Viessman 50 cannot work with both wc and opentherm, it is either not both? Both are setting the flow temperature. For me opentherm is the more logical as i want my rooms to heat up fast which opentherm will do by demanding high temp setpoint until the target desired room temp approached...

My 2 year experience of my Viessman 100w Combi (B1KF) with Evohome on opentherm has been good. The boiler modulates down to 8% output (as shown by Vicare APP) when the evohome setpoint temperature for each individual room has been reached . Its a 35 kW boiler for hot water function and...

I have the viesmann 100w b1kF combi with evohome with 11 zones operating on opentherm , installed May 2021. The vicare app does still work. I can see on the app modulation level, pressure in the system, fliw temperatures, gas consumption. The boiler does have auto combustion control similar...

I ran 28 mm copper from stopcock on ground floor where mdpe comes into house to just before boiler in loft, there are several 15 mm cold water take offs along the way to different sinks baths and toilets , none of take offs impact my combi shower flow or temperature. Toilets refill very fast...

I went for the viesmann 100-w combi in april 2021, 35 kW on hot water , I have heating range rated down to 12kW , it operates very well on opentherm (evohome control on all 11 zones in house) . Modulation turn down on heating is 3.2 kW . The boiler is in loft , the vicare app tells me...

Viessmann installation manuals do not require the use of inhibitor to be added to filling water . If you use inhibitor they blame it for causing blockages hot plate heat exchanger. Viessmann installation manuals also allow potable water to be used for filling . The exception would be if you...

Deareator , made my rads quieter my combi system. Used to hear occasional pebble sound in rads. With regards to corrosion it will remove some dissolved from the first fill but nothing more for it to do,

My combi boiler is approx. 14 years old . Worcester Greenstar CDI 35kW (I think it a very early version of what they now seem to call the Classic). It gets a service now about every two years. I live in Manchester which has a water supply from the lake district with very low total dissolved...

I am not a plumber , I installed myself the Stelrad vita compact vertical 1800 x 500 last week (my first time installing a radiator), the quality of the product appeared very good to me. The bracket system is extremely secure . It does take two people to lift the radiator onto the bracket...