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Discuss Low hot water pressure in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
11
Hello people

I've posted about this before but can't get in to the thread to view the answers

I had a mains eco lite 35 boiler installed in my property. Since having the boiler installed the hot water pressure has significantly reduced!

Previously had a glow worm combi boiler and the water pressure with that boiler was really good

Any ideas what could be causing the poor water flow?

I've attached some pictures of the boiler and pipes
 

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Ric2013

Plumber
Messages
2,672
Main boilers are relatively inexpensive, so it may be performing to a limited specification, but I'll assume it isn't for now.

I would comment that that installation looks to be particularly poor pipework. Looks like a DIY attempt, from that point of view and I wonder what else the installer got wrong? Was the installer Gas Safe registered?
 

Aquarius

Plumber
Gas Engineer
Messages
1,097
What’s the litres per minute from cold mains? What was the previous boilers hot water output in litres per minute? Glow worm made a few combi’s. What’s specified in the new boilers output in litres per minute? Was all of this discussed prior to boiler install?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Messages
26,947
Would say it’s a 24kw so your probably only getting around 8-9 lpm in winter
 

Ric2013

Plumber
Messages
2,672
Would say it’s a 24kw so your probably only getting around 8-9 lpm in winter
Would tend to agree as Google finds no such boiler as Eco Elite 35. Could it be a 24 or 28kW version? We need to hear back from Indi_s otherwise any further speculation is pointless.
 

Ric2013

Plumber
Messages
2,672
i would be more concerned about the 15mm gas line first!!!!!!
Had the installation looked good, I'd be inclined to think it might be a short section only and that the installer had probably calculated this was alright.

As the installation looks a bit amateur, should the OP call out Gas Safe and say they have concerns over the new boiler installation's safety?
 
Messages
11
Apologies the boiler is a 24kw

The boiler was installed by a Registered Gas Engineer

As for the 15mm pipe he was aware this is incorrect but stated in order to change the pipe he would have to lift tiles and floorboards as the gas meter is in a cupboard under the stairs and the boiler is in the living room
 

Aquarius

Plumber
Gas Engineer
Messages
1,097
Apologies the boiler is a 24kw

The boiler was installed by a Registered Gas Engineer

As for the 15mm pipe he was aware this is incorrect but stated in order to change the pipe he would have to lift tiles and floorboards as the gas meter is in a cupboard under the stairs and the boiler is in the living room
So the plot thickens 🙄 so you could be suffering with poor hot water because the installer couldn’t be bothered lifting floorboards and tiles, you didn’t want to pay for this to be done, or both?
 
Messages
11
So the plot thickens 🙄 so you could be suffering with poor hot water because the installer couldn’t be bothered lifting floorboards and tiles, you didn’t want to pay for this to be done, or both?
Not at all I would have been happy to pay but from what he was telling me it was going to cause damage. Plus the old glow worm combi boiler which was installed by the council was on the same gas pipe water flow was amazing
 

Aquarius

Plumber
Gas Engineer
Messages
1,097
Not at all I would have been happy to pay but from what he was telling me it was going to cause damage. Plus the old glow worm combi boiler which was installed by the council was on the same gas pipe water flow was amazing
Yes, but that would have been suitably gas pipe sized. So if your new boiler requires 22mm or even 28mm, then thats what it should have. Undersized pipes can have an adverse affect on the hot water delivery.

If you’re happy to pay, then I’d recommend the upgrade. If it’s got the correct working pressure, then it might be ok.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Messages
26,947
The old one could of been a 28kw you will get a bit more flow rate with that

best thing to do is test how long it takes to fill a 1l container via the hot around 7 seconds is correct
 

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