I’ve explained it already. Your boiler in an older SE type. And yes most of this thread is about premix boilers. That’s been my point all along. ZPG as and yours is fan flued.
Navien Combi Boilers
- Thread starter hard-work
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I’ve explained it already. Your boiler in an older SE type. And yes most of this thread is about premix boilers. That’s been my point all along. ZPG as and yours is fan flued.
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It's irrelevant what Navien say. In the UK there must be no more than a 1mbar drop from the gas meter to the appliances.
It makes no difference that Hard Work can suck a golf ball through a hosepipe it still wouldn't be legal over here on a 1/2" supply over that distance
It makes no difference that Hard Work can suck a golf ball through a hosepipe it still wouldn't be legal over here on a 1/2" supply over that distance
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Shame really. They might be a decent boiler but you've done them no favours in this thread.
When there is zero flow the pressure at boiler is same as at the supply regulator. In #266 you said it drops a few mbar when flow starts, that's > 1mbar.
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If Navien say they can get get 200000BTH's worth of gas (natural gas like ours, mostly methane) down 24ft of 15mm pipe, according to my calcs (which anybody is free to challenge) they must be assuming something like 25mbar supply to get 17mbar minimum at the boiler.
I'm a bit surprised they need 17mbar at the boiler with a negative-pressure valve, I wouldn't have expected that much valve pressure drop, but as I said before I'm not an expert on these things, just trying to look at it from general principles and maybe learn something.
And how about
I'm still saying that the type of boiler most of this thread is about, with venturi etc, is different from older ones (like mine, for example) Do you agree now?
Ignore that, just noticed other reply
Yes, I know, but earlier you asserted (mostly to hard-work) that there is no difference between pre-mix and older types. It turns out that pre-mix is common, not unique to Navien (if anybody thought it was) but that's beside the point.
So it does work then. Fantastic! That is good from someone who knows little about gas controls. Can you point us to a document that say it is illegal? That would be nice.
Sorry explained it wrong. Under working conditions WP, the drop will be more then 1mbr. But the difference between the meter will still only be 1mbr.
Standing pressure at the meter “boiler off” 21mbr. 20mbr at the boiler.
WP “boiler on” 19mbr at the meter 18mbr at the boiler.
Hope I’ve explained it better.
Navien state 17mbr as a minimum. They aren’t allow an 8mbr drop.
It's all in the GIUSP I'm sure a clever fellow like you can find it.
More to the point I expect the largest output boiler that Navien supply in the U.K. Will be about 2/3rds the output of the one on your video.
Considering how much lower the output is you should easily be able to obtain an email from Navien proving us all wrong and that you can run it in the UK off a long 1/2" supply
?Errrrr
Seems Intergas may have realise the error and pulled the page
http://www.intergas-verwarming.nl/wp-content/uploads/2017/09/Intergas-flyer-XTREME.pdf
but on YouTube
at 15 seconds there is the value 127.6 %(hi) ( yes I was wrong I dropped the .6 %
Still no one has explained the (hi) qualifier
http://www.intergas-verwarming.nl/wp-content/uploads/2017/09/Intergas-flyer-XTREME.pdf
but on YouTube
Still no one has explained the (hi) qualifier
No error Bernie boy. We've actually had the boiler retested at another independent facility in the UK with exactly the same result
If you don't like it tough titties I suggest you complain to the relevant authorities.
If you don't like it tough titties I suggest you complain to the relevant authorities.
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