Shower temp fluctuating after new radiators installed - plumber says not his work?

[A1983]

Hello, we have just had a new bathroom installed and 3 new radiators in house, as soon as the work was complete the water temperature in the house fluctuates, most noticeable in the shower! The plumber said this will not be related to his work and to look into it would be an additional cost. Is he correct? Thank you

 

[oldbuffer]

1. What type of boiler. Combi, system, open vent?
2. What sort of hot water system do you have if not combi boiler. Vented, unvented?
3. Is this fluctuation noticeable at all hot water outlets?

 

[terryplumb]

Is the shower itself new ? What type of shower is it ?

 

[A1983]

I believe it's a combi (I'll check) and yes all water outlets are affected, old shower/bath and new shower. It's hot for 30 seconds, colder for 30 seconds and so on

 

[Madrab]

Check whether the boiler fires, heats up and then switches off and then back on and off and continues like that, if so then there could be a correlation between the work that was done and the system now behaving as it is. I think it's a bit much that they want more money just to look at the issue before deciding that it is nothing to do with the work that was performed.

If it was then found to be coincidence then fair enough but that can't be established until it was looked at properly.

Basic customer service IMO, especially given he's probably made plenty with the work already completed.

 

[Harry Bloomfield]

I believe it's a combi (I'll check) and yes all water outlets are affected, old shower/bath and new shower. It's hot for 30 seconds, colder for 30 seconds and so on

Was the hot and cold problem, evident before this work was done?

 

[A1983]

Thank you for replies, I heard the boiler sounding like it was firing up and stopping whilst shower in use so I'll double check that, thank you!

And no, no water issues before work was done

 

[RrogerD]

Thank you for replies, I heard the boiler sounding like it was firing up and stopping whilst shower in use so I'll double check that, thank you!

And no, no water issues before work was done

Does the system need bleeding and subsequent topping up? Are all the rads throughout the house, particularity those upstairs inc any towel rails, getting fully warm / hot at both their top and the bottoms?

I'm not a plumber so just a guess really.

 

[A1983]

I haven't noticed the radiators not being ward enough and yes I believe equally hot both at top and bottom

 

[A1983]

I know he bled the radiators when he fitted the new ones?

 

[A1983]

Ps seems its just the water that's affected

 

[terryplumb]

Sounds like a blocked plate heat exchanger in the boiler,if all taps are running hot/ cold/ hot/ cold repeatedly

 

[A1983]

And would that be something 'caused' by the plumber and his work or something separate? Thanks Terry

 

[terryplumb]

Highly unlikely to be anything whatsoever to do with fitting new radiators/ taps/ showers.
It's invariably caused by a build up of magnetite within the primary circuit of the plate hex.

 

[Madrab]

It would be a little coincidental when it didn't do it before and has now just started it since the new rads were installed. Could some sediment/crud that was sitting in the pipework/rads have been picked up by the drain and fill and it then ran itself into the plate HEX by the rad work, I could certainly see that as being a possibility. Hard one to prove though.

Is there a system filter and how clean is the system?