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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...

For rads output at different flow rate I use the attach table which is roughly the same as you stated in your post. So in my case I just multiply the T50 rad output with Rad temperature rating e.g. 51.5 in my case hence the 8.1kw number I am getting in my spreadsheet against 11.8kw of heatloss...

Correct. My rads oversized and I have stated the name plate or stated output of the rad in this column. The next column is oversized factor which is 'Heatloss divided by stated output' Correct. I don't know the return temp to boiler but flow temp of boiler is 49.5DegC. Rooms get to the...

I upgraded my non condensing boiler to a condensing one this winter. - I had 40kw boilers (2) to heat the house and the property had no insulation (these were the days when gas was really cheap; I am not in UK, outside temperature in my area remains in single digit) - I did room by room...

Good advice.

Read 1, Read 2, Read 3 1st Step : get this done. 2nd Step : You'll get an inflated number in KW/btu to start with. 15 years ago no one cared about gas prices but these days we do (home owners)! Gone are the days when bigger was better! (for rads it is still true though) For peace of mind get the...

Pros here can advise you about which brand to buy but if I were you: - this is the worst time of the year to buy a boiler but if you have to (because your current one is not working) then get hold of a reliable heat engineer in your area for the peace of mind and do it properly. - I wouldn't...

I was in a similar position as you last year. Didn't know the difference between heat only, regular or combi! This forum has taught me so much that I not only did a heatloss calculation of my property but it helped me select an appropriate boiler to suit the property. I had a system installed...

Haven't this topic (or forum) given you enough already to hang yourself!

Knowledge is power and helps you make decisions in a logical manner!

Great, for me moral of the story is regular maintenance of heating equipment.

I installed an old dial type thermostat inside the FCU, I think it is called a bimetallic stat. I checked the thermostat by dipping into hot water first but it doesn't activate the fan, once it is cooled down only then it will activate the fan, is it suppose to work like this? I thought I want...

No, there isn't, its an older unit.

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...

See attached

I measured the distance from floor to the base of the radiator; in my case it was ~8 inches. I had some wooden pieces lying in house; I stacked them to get to the desired height - 8 inches. Put radiator alongwith brackets on those wooden pieces to align the pipes. Then mark edges of the brackets...

Theoretically speaking and what I have read in books, I think you need to know: - the head loss of your system (depends on pipe size, flow rates, design and layout of rads) so you can draw system curve of your heating system. - pump curves of your model from manufacturer which will tell you...

but that would defeat the purpose of heating, wouldn't it? What would happen if we oversize the rad but keep the flow rate at 50?