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Please share your experience after installing it as I might follow your lead though I have a different boiler than yours.

Thanks John for your detailed working on this, I will measure the condensate output again. I have been very meticulous in terms of gas usage and logging m3 consumed almost every hour during boiler operation but have not been able to control the usage.

Can't say they are perfectly balanced but as far as I can tell from copper pipes of rad at flow and return, they seem to be balanced. I need to play a little with pump speed though. Flow-return delta on boiler increases if I set the pump on c1 setting (return drops to 35.5Degc), but I felt rads...

I have also tried to change the pump speed to its lowest setting (C1) but at this flow temperature, heating in rooms couldn't get to temperature. Rads were luke warm and boiler kept on running at its minimum flame level and was on a bit longer than usual. Once CH is upto temperature the boiler...

Correct. I have measured the return temp of boiler, collected and measured condensate which was about ~1.5 litres per hour. This tells me that boiler is condensing but when I try to calculate efficiency based on heatload they don't add up? The boiler's turn down ratio is 1:3 so at 12.9 kw max...

Rads are the same as last year when I had non condensing boiler. I think I may have skewed heatloss calcs a bit, not sure. Hence this post.

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.