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My bad, the manual does give minimum inlet pressure, at the test point. It's on page 37, says 15mb for the ecoTEC plus 637. There'll be some loss before that point, gas iso valve etc. There doesn't appear to be test point upstream of that, so unless one is added on the pipe just before the...

Interesting. I haven't (yet) found a manual which gives actual required gas pressure, but several of them say 20mb (nominal) which is something!

I wasn't trying to tell you anything you didn't know! I remember seeing a boiler manual which specified an actual pressure requirement. I'll try to find it.

Do you mean the 20mb? Because it could be 17.5mb and meet the regs. Perhaps they say 20 to give themselves a getout, don't know whether they'd get away with it!

I'd be a bit sceptical about the 9.5mb. My boiler needs about 10mb at the burner at design output, so if it's anything similar clearly 9.5mb is too low. There would be some pressure loss over the gas valve and the pressure at the burner, and boiler output would fall. Boiler manual here in case...

Is the maximum loss between meter and boiler still 1mb?

Hope it wasn't a cold day. Are they recruiting? :giggle:

No, but ban halal and kosher slaughter on animal welfare grounds and the question doesn't arise.

The minimum must have changed then, 21+2 = 23mb still

Sounds like a try-on to me. For one thing, if those are the pressures he says are a problem, you'd expect them to be noted on the report.

I thought pressure out of the meter was 21+/-2mb, so minimum 19mb.

More of the same, you don’t answer my questions but resort to insults. You claim I’m wrong but don’t say how. Do you really mean to go on a public forum and admit you can’t understand simple pictures on a web page? As I said before, the pressure loss for a sharp bend given by both online...

Teach the child the three Rs and mind his own business

If you don't know, you're part of the problem

Any chance of getting a gas fire? Cheaper to run than electric. One in the living room would help, some heat would circulate round the house. Failing that a free-standing propane heater.

That's good coming from somebody who can't understand a picture, never mind figures. I know you've got so far into this you can't admit you're wrong, but you're really past a joke now.

OK have it your way. I've tried, you clearly don't understand basic science (or logic) I'm out of here.

I asked you to let me know what you get. What's the problem? How many times do I have to explain it? I gave details of the headloss factors for both types in #12 and #15. Didn't you understand the picture in the online calculator? I would hope you're a competent plumber, but you clearly don't...

Same here. Many years ago the number of men wanting to behave as a woman was very small, but those who did, even if they'd had no surgery, provided they weren't too obviously male, could use women's toilets and nobody would notice. He'd have the sense to avoid a situation with communal showers...

It's not elbows, it's form bends. Elbows (on these 2 online calculators) are sharp (mitre) bends, there's even a picture for those who have difficulty with the difference Gas Pipe Calculator Enter 33.8kW, 3.14m3/h, 2 off 90 form bends, 1m pipe, 15mm copper pipe Gas Pipe Sizing Calculator...