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Hi, My viessmann heat only boiler 13kw (OV) is running at flow temp of 54.5DegC and a return temperature of 40DegC. I know it is a crude way of getting the return temperature on boiler. In the 2nd picture showing the return temperature you can spot the sensor attached to return pipe next to...

Hi, I have a Fan Coil unit in lounge and radiators in Bedrooms and Bathrooms. I also have a wired thermostat in Lounge with the boiler which is set to 19degC. Issue - FCU never turns off, it keeps running, if boiler is firing, FCU will blow hot air but when Boiler trips and as water temperature...

I have a Viessmann compact heat only boiler used for Central Heating only. Issue: When boiler starts (even from cold) the flame intensity or level stays on minimum on display (see attached picture). I have been advised by Viess Tech support to notch up the CH dial but even on setting 6 the...

Hi, I have a heat only boiler for central heating only, not installed or commissioned yet. I am trying to understand electrics; e.g I got a wiring center (pre wired) for Y plan system. At this stage I only want to control Central heating through programmer and thermostat (no hot water). The...

I thought, I'll start a new thread for clarification. Does this look right? If I have understood it clearly, it is a flow loop from boiler to rads?

If anybody has an old outdoor or weather compensation sensor lying around as spare, PM me, I'll be interested. I hope it is not against forum rules, I tried to search it but couldn't find if it is forbidden to post queries like these.

Hi, I would like to hear from people who have been using heat only boiler, which are the most frequently changed parts in this type of boiler? sensors etc Thanks

Hi, Attached please find pictures of a boiler that I intend to buy for my home; a 13kw (used) viessmann regular boiler with pump and diverter valve (in the picture). What else do I require for installation and spares that I can get from London before it is shipped to me. I am not in UK and this...

Hello, I am looking at Zanussi Ultra System 18kw. Does anybody has any experience with this brand in boilers. I have heard about thier other appliances like hobs and dishwasher but not much on boiler. https://www.freeboilermanuals.com/assets/pdf/Zanussi/zanussi-system.compressed.pdf A brand...

Hello, I am researching for a residential boiler. I have seen specs sheet for various boilers and they have written average gas rate as 1.8 m3/hr for 18 kw boiler. I am interpreting that if the boiler runs for 1 hour at full load it will consume 1.8 m3/hr? Is it correct. It is important for me...

I have one of the attached heating coil unit (fan assisted) installed in my lounge. The Lounge is about 650sq.ft so instead of radiator we installed one of these. It works quite well, the unit's is one of the last in circuit and its valves are fully open, there's no thermostat installed with...

I have a 320 sqft double storey house with 6 bedrooms. The house is serviced by two heat only boilers (non condensing); a 120k btu (35kw) and a 70k btu (20kw). Both Boilers are installed at ground floor (120k at front and 70k at the back). Front boiler serving front downstairs and upstairs rooms...

My old gas fired boiler has 3 settings, I ran the central heating for 2 hours to observe boiler cycling at lowest pump speed setting; it will fire for 7-8 minutes and when preset temperature setting is reached it will switch burner off for 10 minutes and cycle continues. It consumed 2.1m3 of gas...

I had an old non condensing boiler (with pilot flame) with a rotary thermostat knob and sensor installed near heat exchanger. I had a timer fitted next to it and it will turn it on at 0500-0800 and then 1600-2100 hrs. I have logged its gas usage so I know how much it was consuming. I used to...

Hello, I have an old heat only gas boiler (35kw). I recently installed PV system at the roof, this will be my first winters (hopefully) with PV system! I have an immersion heater 50 litres right next to the boiler feeding hot water to a bathroom. My question is that if I feed hot water from...

Hello, I am not in UK so please be gentle! I have an old heat only boiler 120,000 btu for CH with no DHW installed downstairs and an expansion tank installed upstairs. For DHW we use a separate boiler. For CH the property has 3 radiators 600x1200 Type 11 and 1 electric convector for a huge...