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Discuss Boiler overheating High Temps in the Water Underfloor Heating Installations area at PlumbersForums.net

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ShaunCorbs

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Spot on and there's your problem

Your boiler will only modulate down to around 7kw and your biggest loop is 1.9kw

So your way under the min the boiler can cope with

You have a couple of options but it's not going to be cheap and involves ripping up some floor boards
 
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Mossy007

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This
Spot on and there's your problem

Your boiler will only modulate down to around 7kw and your biggest loop is 1.9kw

So your way under the min the boiler can cope with

You have a couple of options but it's not going to be cheap and involves ripping up some floor boards
Whats my options please?
 

ShaunCorbs

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Your easiest option is to put a rad somewhere on the main returns that can increase the capacity upto 7kw

Some more options eg low loss header or change the boiler for one that has a lower modulation rating
 
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Mossy007

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Your easiest option is to put a rad somewhere on the main returns that can increase the capacity upto 7kw

Some more options eg low loss header or change the boiler for one that has a lower modulation rating
 
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Mossy007

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This is excellent information. Will this definitely sort out the issue?
 

ShaunCorbs

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This is excellent information. Will this definitely sort out the issue?
If you can get the lowest loop upto 7 kw yes

At the moment it can't get rid of the heat eg it's making 7kw and only requires 1.8 kw etc
 
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Mossy007

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If you can get the lowest loop upto 7 kw yes

At the moment it can't get rid of the heat eg it's making 7kw and only requires 1.8 kw etc
The problem is finding a competent plumber to explain this to. I have had so much conflicting information. What you have advised seems to be spot on! Is this why the boiler cycles on and off? Is this normal for underfloor heating? The rad option is probably going to be difficult as my boiler is in the kitchen and it is a tiled floor. Would you recommend a boiler replacement make and model?
 

ShaunCorbs

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That's normal esp with the influx of fast training etc

Yes can't get rid of the heat quick enough

And unless everything is calculated eg sized right and loadings so they meet the min

I don't think your going to get one with a low enough modulation eg down to one or two kw
 
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Mossy007

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That's normal esp with the influx of fast training etc

Yes can't get rid of the heat quick enough

And unless everything is calculated eg sized right and loadings so they meet the min

I don't think your going to get one with a low enough modulation eg down to one or two kw
So my only option is to fit a radiator?
 
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Mossy007

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Yes to bump it upto 7kw

Or to live with it, which isn't the best option
You seem like an expert. Auto bypass, pipe thermostat, mixer valve all these potential repair options that have been advised by different users/ plumbers will any of these not do the job? What’s the worst that can happen if I left it as it is? Baxi have changed the thermostat and the issue of boiler overheating and switching off has not been apparent lately. Will I need to change thermostat every couple of years on the boiler?
 

ShaunCorbs

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Auto bypass will help,

Pipe thermostat won't do bugger all
Same with a blending valve

And will put undue wear on the boiler but shouldn't harm it that much
 
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Mossy007

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Auto bypass will help,

Pipe thermostat won't do bugger all
Same with a blending valve

And will put undue wear on the boiler but shouldn't harm it that much
I shall look at the radiator option for now. Thankyou so much for all your informative advise. It’s truly really appreciated.
 
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