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Hi, In attached picture what's the highlighted screw for on non return valve? This is to attach a filling loop for a sealed system. Thanks in advance.

Boiler : Viessmann Vitodens 100-w OV heat only boiler. pump : Wilo variable speed pump; CH only - no dhw on boiler. I bought a WC sensor basic (see attached photo) and connected it via provided lead to the boiler on port x21 on board. The external pump is connected to the boiler on port 20. When...

Hi, I have 160 litre vented DHW cylinder. I am trying to put a re-circulation line from cylinder to farthest fixture which would be going through two bedrooms till it reaches the farthest fixture. I have bought a recirc pump Grundfos comfort BA 15-14 BA which i would be putting on...

Hi, Where can I get a temperature sensor attachment for the attached grundfos pump and what does it do? Thanks

Hi, I intend to convert an OV system (with F&E setup) Heat only boiler to a sealed system. Is my understanding correct with this kit with the labels? Thanks in advance.

Hi, Attached is a basic wiring layout of room stat + programmer working with Viessmann heat only boiler. (pic 1) I have installed a weather compensation sensor as per schematic (pic2). When I switch boiler on it shows the display with temperature and CH symbol but it is not igniting. Is there...

Hi, I have a Viessmann vitodens 100-w (compact 13kw) boiler installed in OV configuration (2 pipe system) for CH only. It has a drayton (LP722) timer and a dial type Room Stat. My CH load is under 7 -8 kw. This year I have bought a Weather compensation sensor and cable which is straightforward...

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...