[Help] Any Plumbers? Intermittent Hot Water

[BN9 BHA]

Thanks and here you go.

You have got small bore (10mm) pipes to the radiator but this is very common in properties built in the last 20 years.
I don’t do power flushing but I’m surprised someone has said that pipe work is too small for a power flush seeing as so many newer homes have it.

 

[BN9 BHA]

Maybe, but he quoted for the work.

Did you get the second opinion from the local firm as a written quote? If so show this to the Alpha Boilers service engineer that is visiting tomorrow

 

[alanfp]

As in replies to legal questions, IANAP !

When you say "no hot water" do you mean it's coming out cold? Or do you mean it's coming out nowhere near as hot as it should be/luke warm?
If the latter, it COULD be partially blocked heat-exchanger plates. I had an issue where the temp VARIED every minute or so - the blockage meant that the temp got so high that the boiler cut itself off completely. Then when it all cooled down a bit it would fire up and I'd get hot water for a minute or two until the cycle started again.
However if it's a case of sometimes hot water and then sometimes not, I would suspect 'diverter valve'.

 

[alanfp]

You have got small bore (10mm) pipes to the radiator but this is very common in properties built in the last 20 years.
I don’t do power flushing but I’m surprised someone has said that pipe work is too small for a power flush seeing as so many newer homes have it.

Would power flushing the radiators and their pipework help with "no hot water"?

 

[BN9 BHA]

Would power flushing the radiators and their pipework help with "no hot water"?

I don’t know the answer as I’m a plumber and not a boiler engineer.
I know someone that had a new combi boiler fitted to an old heating system, a power flush was carried out at the time of installation. The boiler had an issue a year later I think similar to yours, the boiler was under guarantee but the boiler manufacturer’s engineer said the water in the heating system was dirty and needed another power flush.

I would find out the exact answers from the engineer that is visiting tomorrow

Edit- sorry I’ve just realised you are not the OP

 

[Since1982]

I don’t know the answer as I’m a plumber and not a boiler engineer.
I know someone that had a new combi boiler fitted to an old heating system, a power flush was carried out at the time of installation. The boiler had an issue a year later I think similar to yours, the boiler was under guarantee but the boiler manufacturer’s engineer said the water in the heating system was dirty and needed another power flush.

I would find out the exact answers from the engineer that is visiting tomorrow

Edit- sorry I’ve just realised you are not the OP

Thanks, good advice.

 

[Since1982]

Did you get the second opinion from the local firm as a written quote? If so show this to the Alpha Boilers service engineer that is visiting tomorrow

I did. Have the quote but his view that it was unnecessary was just verbal.

As in replies to legal questions, IANAP !

When you say "no hot water" do you mean it's coming out cold? Or do you mean it's coming out nowhere near as hot as it should be/luke warm?
If the latter, it COULD be partially blocked heat-exchanger plates. I had an issue where the temp VARIED every minute or so - the blockage meant that the temp got so high that the boiler cut itself off completely. Then when it all cooled down a bit it would fire up and I'd get hot water for a minute or two until the cycle started again.
However if it's a case of sometimes hot water and then sometimes not, I would suspect 'diverter valve'.

It's either lukewarm or normal temp. It doesn't vary from one to other minute by minute, it's either as it should be or lukewarm at best.