Lukewarm water Biasi - low flame for DHW

[sealed]

I have a Baisi m90e24s combi. Since I moved in a month ago, have only had lukewarm water though it runs much warmer when running dhw at lower pressure. The flame burns visibly lower for DHW then for CH - there are no problems with CH or rads.
Engineer checked it the other day and suggested it might need a new heat exchanger and sensor. Gas flow was fine and dhw dial is turned to max.

Is it possible that cleaning the primary heat exchanger would be enough to fix this - rather than spending £200+ on getting a new primary heat exchanger fitted?

Or could it be caused by another issue?

 

[Agile]

"Moved in" ? Are you renting the property?

I can say you don't need a new main heat exchanger but you do need a new engineer.

I need the answer to my first question before I advise you further.

Where do you live?

Tony

 

[sealed]

Hi Tony,

I own the property but bought less than a month ago. It's in East London

 

[Agile]

I would be virtually certain that it is not the main heat exchanger.

But there are many possibilities as to the cause and many are gas related which we don't advise on here.

However I would expect that the cost would range from under £100 to about £180 maximum based on my charges.

But obviously I have not seen your boiler and can only base that assessment on my experience of fixing that model of Biasi.

Tony

 

[DP]

Sealed, for hot water, flame would actually be larger than for central heating (if heating has been on for a while and is up to temperature)

Check the amount of water hot tap deliver at full flow over 15 seconds, multiply by 4 and answer should be about 9.5 litres.

 

[sealed]

Sealed, for hot water, flame would actually be larger than for central heating (if heating has been on for a while and is up to temperature)

Check the amount of water hot tap deliver at full flow over 15 seconds, multiply by 4 and answer should be about 9.5 litres.

Have just checked twice and the amount is 5.6 - 6.4 litres.

Water is initially hot then cold and is then lukewarm btw

 

[Phill Peck]

Water is initially hot then cold and is then lukewarm btw

That's pretty good for a biasi

 

[sealed]

If moving the black box up or down changes the flow then I'm puzzled because the flow has remained the same whether fully up or down at around 6.9l. Flow switch problem too?

 

[Calmore]

Water is initially hot then cold and is then lukewarm btw

That's pretty good for a biasi

After following the advice of Agile (and others) to fix our Biasi, ours is now scorchingly hot

 

[DP]

Sealed, for hot water, flame would actually be larger than for central heating (if heating has been on for a while and is up to temperature)

Check the amount of water hot tap deliver at full flow over 15 seconds, multiply by 4 and answer should be about 9.5 litres.

Have just checked twice and the amount is 5.6 - 6.4 litres.

Water is initially hot then cold and is then lukewarm btw

5.6-6.4 l per minute?

 

[sealed]

Sealed, for hot water, flame would actually be larger than for central heating (if heating has been on for a while and is up to temperature)

Check the amount of water hot tap deliver at full flow over 15 seconds, multiply by 4 and answer should be about 9.5 litres.

Have just checked twice and the amount is 5.6 - 6.4 litres.

Water is initially hot then cold and is then lukewarm btw

5.6-6.4 l per minute?

Yes. I repeated a few more times and it was close to 6.9 l/min.

 

[DP]

In that case would be looking to see if the gas line is correctly size for blocked
Not a task end user might undertake

 

[Phill Peck]

Water is initially hot then cold and is then lukewarm btw

That's pretty good for a biasi

After following the advice of Agile (and others) to fix our Biasi, ours is now scorchingly hot

Is it on fire?

 

[sealed]

Water is initially hot then cold and is then lukewarm btw

That's pretty good for a biasi

After following the advice of Agile (and others) to fix our Biasi, ours is now scorchingly hot

Is it on fire?

Yes it is. Seems to come out hot even before the flame lights