Gas pressure at boiler

booty40uk

[/Actually, no, I specifically don't want a combi.QUOTE]

I wasnt aiming this at you. It was for the original poster.

But are the boiler requirements saying it needs a 22mm connection with a certain flow/pressure. Or are they saying that the pipe must be 22mm from source to boiler?

MI's will stipulate a 22mm connection at the boiler. This obviously means 22mm minimum from the meter to the boiler. Depending on the load, this may even need kicking off in 28mm. But, none of this is relevant until you decide what boiler you are going to have. Then, and only then, will you be able to size the pipe run accordingly in regards to gas rate.

If i were to quote your job, i would want to know what boiler you wanted so i could then calculate the required gas pipe run, rather than try to find a boiler that will suit your existing pipework because i doubt you will find one.

You may or may not be able to just change the last 2m of 15mm to 22mm but no one can summise that as yet. But, being in a solid floor, who's to say it wont be 10m despite what you can see capped off.

Personally i would take the opportunity to get any gas pies out of a solid floor in any case, but thats another thread.


And dont use whoever it was that assured you it was ok.

srcandas

booty40uk wrote: »

MI's will stipulate a 22mm connection at the boiler. This obviously means 22mm minimum from the meter to the boiler. Depending on the load, this may even need kicking off in 28mm. But, none of this is relevant until you decide what boiler you are going to have. Then, and only then, will you be able to size the pipe run accordingly in regards to gas rate.

Booty you comments are very useful and are good stimulous to decision making so thanks for that. But like all situations without seeing the problem it is obvious that simplified rules do not meet the need.

My options are now narrowing down to:

If the current pipes will not meet the need for a combi (which I now 99% accept despite being told otherwise) then my options are a combi in the airing cupboard or loft; and addressing the softener/conditioner issue.

or

Replace system boiler in situ if the current gas is ok, and replace tank in airing cupboard

or

position system boiler upstairs (two location options) with new tank.

Now the cost of the boiler, which ever option I take is a small proportion of the cost. And providing it heats efficiently and is economical who cares. So choosing a boiler without understanding the options is not in this case the way to go

(and as I've seen here it is the professionals who bicker over which is best. Punters are trying to find solutions to household problems. It is not although it is a car for g0ds sake :rotfl:).

But with the input here it looks like combi in airing with combimate. Water softener is not a practical option and this at least frees up space. And the gas will be between ceiling and floor so not external as has been suggested. And total cost for anyone interested will be £3255 incl VAT and all returned as good as new

May not be the best deal or best solution but I can spend no more time on it. So thanks everyone :beer:

keystone

srcandas wrote: »

You are miss-reading if this relates to me.

Well I might have misinterpreted it and yes it does relate to you. I was having to guess from the information given in Post Number 1 seeing as how as Iwent back to first principles necause the thread had gone off course a little.

I have quotes from qualified RGIs which say:

The pipes DO need replacing
The pipes DO NOT need upgrading
The pipes may in part need upgrading

Well at the risk of appearing rude which I don't intend perhaps if that data had been given in the first instance then your mindset would have been more easily understood leaving no room for guesswork. The first and the third are essentially the same. The second may be offering a different boiler that can use the existing pipework or he might just be trying to get away with it. No idea from here. Perhaps it would help peeps to help you if you could:

a) Use the exact wording that each used in respect of the pipework.
b) Give a clue as to ehoch boiler each was offering.

No one is trying to avoid anything. Just looking for honest answers no matter what cost that may lead to.

Ok I'm sorry but that was the impression Post Number 1 was giving me on pure inconvenience grounds.

It maybe a fact of life but when changing a boiler there seem to be many conflicting facts of life. Each RGI I have met seems determined that they are right

Of course but there must be differences between the quotes.

But we will get there :beer:

Of course you will.
Cheers

srcandas

Keystone sorry but I didn't know you couldn't ask a simple question, but had to post jobs in 'War and Peace' form :rotfl:

But anyways that's all from me for now unless I can help any other punters :beer:

keystone

srcandas wrote: »

Keystone sorry but I didn't know you couldn't ask a simple question, but had to post jobs in 'War and Peace' form :rotfl:

You don't but then again if you do post a question thats open to interpretation or is lacking in essential data and it evokes an answer you didn't want then perhaps you shouldn't be surprised.

Cheers

rxbren

surely its the rgi's job to spec the boiler for your needs and not for you to say what boiler you want

srcandas

rxbren wrote: »

surely its the rgi's job to spec the boiler for your needs and not for you to say what boiler you want

If you are incredible stupid that might work

Sorry rxbren that was a bit hard. But the idea all punters are thick and all RGIs are unbiased and know exactly what's best grates badly. You only have to look at other threadss to see the incredible battles that go on, even to the point of tradesman being suspended from this forum. And then the threads of people who have been left with something far short of expectation.

At the end of the day spec'ing a boiler is not rocket science. Overcoming installation problems and knowing the options is. That is where those with experience should be able to help.

Jusy my opinion of course

srcandas

keystone wrote: »

You don't but then again if you do post a question thats open to interpretation or is lacking in essential data and it evokes an answer you didn't want then perhaps you shouldn't be surprised.

Cheers

Is there any practical way to have measured the gas pressure/flow at the input to a boiler?

Thus meaning you can choose a replacement boiler which will work?

You are going to have to help me here keystone. What is it you find so hard to understand? The first part is a Yes/No question. The second is a little further explanation of the question.

The answer is as I now know for the benefit of those interesting in knowledge and not selling there decisions to tradesman who cannot agree on almost anything is:

No you cannot. Most demestic boilers have no facility to measure pressure and flow at the input point.

Simple eh?

:beer:

keystone

OK then I'll play even though I'm starting to tire of this.

1. Is there any practical way to have measured the gas pressure/flow at the input to a boiler?

2. Why do you want to know?

3. Because I have had three different RGIs give me three different answers about whether or not my gas supply pipework needs upgrading for a new boiler an I'm confused can you help me please?

Now if 1. had included the data supplied in 3 then it would all be over and done with much more easily.

Do you see the point?

You are going to have to help me here OP. . What is it you find so hard to understand? The first part is a meaningless question without qualification. The later part of your first post gives no assistance in answering the first question because it add one single one iota. Now you may know what you were meaning but you need to understand that you have to express your question in such a way that people can actually understand it without having to resort to guesswork. Is that so difficult to understand?

The answer is as I now know for the benefit of those interesting in knowledge and not selling there decisions to tradesman who cannot agree on almost anything is:

No you cannot.

Perhaps you would be kind enough to rephrase that in such a way that a bear of exceeding small brain like myself can understand it because as you have written it it's gobbledegook whether you meant it to be or not.

Most demestic boilers have no facility to measure pressure and flow at the input point.

They don't need to and why should they need to to and it's domestic anyway.

Simple eh?

Thats what's starting to concern me.

Cheers

plumb1_2

Yes, the pressure can be tested at the meter and the appliance, using a meter.
The flow/gas rate can be calculated, by measuring the length/size of pipework and any bends/tees and elbows fitted. But you have to have a guess-timate as most pipes are not visible.

Most rgi are not going to put a test a on your system when doing a estimate/quote, as they will be resposible for your system, having to make any repairs if needed or turn your gas off if unsafe.