Out of the meter it's 21mb +/-2mb, so minimum out 19mb, and the regs say not more than 1mb loos in pipe to boiler. Though most boilers could cope with a lot less than 18mb. I don't think the elbow is as bad as 10mm, it's a standard 15mm, I have similar ones in stock.
New combi install, help needed
- Thread starter LeeroyK
- Start date
Sponsored Links
Just checking what boiler you have? The new 100W?
Can I also check are you only physically getting 6L/Min at the outlet with the outlet fully open? Depending on the answers then I think the gas pipe isn't where your issue lies.
As was asked before, was the benchmark completed and was it marked up with the cold and Hot Water temps and flow, what is marked on that? Are you getting higher flow at any other outlet, what is the cold flow at the same outlet as the hot? I think you need to look at and rult out other areas first rather than just defaulting to the boiler being at issue.
That being said you installer should be willing to come back and investigate, find where the issue lies and then advise.
Can I also check are you only physically getting 6L/Min at the outlet with the outlet fully open? Depending on the answers then I think the gas pipe isn't where your issue lies.
As was asked before, was the benchmark completed and was it marked up with the cold and Hot Water temps and flow, what is marked on that? Are you getting higher flow at any other outlet, what is the cold flow at the same outlet as the hot? I think you need to look at and rult out other areas first rather than just defaulting to the boiler being at issue.
That being said you installer should be willing to come back and investigate, find where the issue lies and then advise.
Those online fixed-price places tend to use subcontracted installers who are themselves on a fairly low fixed price, which is why you end up with low quality work that's been rushed. You may have paid the online company a lot of money, but the actual installer won't have seen very much of that, hence him not wanting to do any extras "while he's there".
Can you post a photo of all the valves and pipework under the boiler?
Can you post a photo of all the valves and pipework under the boiler?
Sponsored Links
B
Bodd
Can you send pictures of the installation?
There are some earlier in the thread, they're not pretty
The other issues are with installers that are based say in Liverpool but cover the whole country leaving home Monday early and going back at the end of the week. They get given one or two days for the whole job and end up bodging because the next job starts tomorrow.
When I was a service engineer I turned literally dozens of them off until my boss called me to complain. After that I was never sent to another one of their jobs
Yes the new 100w.
Yep, outlet fully open. The mixer tap that is on the same pipes as the boiler sees 17+L/m cold and around 7L/m hot coming back
I dug out the benchmark:
Gas rate 3.121 18.5mbar
Flow rate 12.5
CO73 co.co2 0.0007 ratio
Further down in the benchmark it has a section around Domestic Hot water, within that there are a couple of questions
1) Cold Water inlet temp
2) HW has been checked at all outlets
3) Temp
4) Water Flow Rate
What does that section say?
The cold outlet upstairs in the bathroom next to the hot outlet that is giving 6L/Min, what is that delivering?
OK, so by the looks of it, he checked all the outlets and marked it as ranging from 12L/Min to 5L/Min, that would mean that at least one outlet is producing 12L/Min @ 31deg rise, I assume the 5 was at the bathroom.
Do you know the type (code) of the new 100W you have? There are 3 combi types. If you say you have the 35Kw version then it has a peak HW delivery of ~17L/Min @ 30Deg K(deg C) rise. Given the DeltaT rise marked on the benchmark then it's reaching it's delta but not it peak flow. The amount of HW you should be getting is either down to the size of boiler or the pipework/outlets. If your highest output is 12l/Min, with a 17L/Min mains flow then it's not getting anywhere near that.
Looking at the gas pressure (if that's a working reading) then it looks OK and shouldn't be the reason for the lack of HW but the gas rate seems pretty low, certainly for the 35Kw at max rate. Would certainly say it needs some investigation (Check you actually have the 35Kw boiler, should be on the data plate if you can find it without removing the cover) but it should really be the installer that is doing it. I am surprised that he didn't point out that the HW delivery was no where near where the 35Kw should be.
Do you know the type (code) of the new 100W you have? There are 3 combi types. If you say you have the 35Kw version then it has a peak HW delivery of ~17L/Min @ 30Deg K(deg C) rise. Given the DeltaT rise marked on the benchmark then it's reaching it's delta but not it peak flow. The amount of HW you should be getting is either down to the size of boiler or the pipework/outlets. If your highest output is 12l/Min, with a 17L/Min mains flow then it's not getting anywhere near that.
Looking at the gas pressure (if that's a working reading) then it looks OK and shouldn't be the reason for the lack of HW but the gas rate seems pretty low, certainly for the 35Kw at max rate. Would certainly say it needs some investigation (Check you actually have the 35Kw boiler, should be on the data plate if you can find it without removing the cover) but it should really be the installer that is doing it. I am surprised that he didn't point out that the HW delivery was no where near where the 35Kw should be.
I would guess that's the nameplate gas rate. Might be a good idea to measure the actual flow, easy enough to do by reading the gas meter over a timed 60 second interval.
B
Bodd
If the house warrants a 35 kW boiler them it must be a size. Could some of the pipework be 28mm?
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
Sponsored Links