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Posted: Tue Apr 23, 2019 6:28pm
Very helpful member
Relyat wrote on Mon Apr 22, 2019 12:10pm:
When the housing is installed, fit a piece of flexible flue from the boiler chimney right to the top of the housing. This reduces the chance of fumes being blown back down into the boiler and smothering the flame. You might also want to resite or remove any CO2 sensor on the boiler, obviously not...
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... if it's moved indoors.
Flexible flues should not be used...see manufacturers instructions. Correct flue should be fitted.
Posted: Wed Apr 24, 2019 4:52pm
I have my gas water heater in an outside porch and it always blows out. Had the problem for years and am now changing to sola.
swcoulthurst wrote on Tue Apr 23, 2019 6:27pm:
Don't understand the 'baffles' bit. Don't put anything inside the flue. It is designed to provide the correct amount of air to gas ratio. If you restrict it, it will have too much gas and not enough air. Multipoint will lock out due to incorrect mixture.
The baffle is obviously baffling.
It does nothing to restrict air flow, only speed and direction.
With regard to your other comment, there is no restriction with using flexible flue within the outer casing. It acts in the same manner as when the boiler is fitted indoors, it merely directs the exhaust to the exit point.
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Cheers. I’m getting a housing built round it. I have solar but maybe not enough for a water heater but will have to consider adding more if the housing doesn’t solve anything. Anyway it’s only off for a f
Posted: Thu Apr 25, 2019 12:04am
Very helpful member
Relyat wrote on Wed Apr 24, 2019 5:22pm:
The baffle is obviously baffling.
It does nothing to restrict air flow, only speed and direction.
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With regard to your other comment, there is no restriction with using flexible flue within the outer casing. It acts in the same manner as when the boiler is fitted indoors, it merely directs the exhaust to the exit point.
Back to the baffles. If you put anything inside a 4 inch flue it reduces the area for free movement of air. If it goes outside the flue, it doesn't effect the volume of air. However there are set distances for flue positioning by the manufacturer and building regulations.
I didn't actually say the flexible flue creates a restriction. What I said was flexible flues do not comply to regulations. Although from what I've seen, very little complies with regulations in Spain.
I am actually a gas safe registered heating engineer.
The baffle that I mentioned was fitted to the base of the housing, not the boiler. As I stated it does not restrict the amount of air able to circulate around the boiler, but merely prevents it gusting through between the boiler and housing. Baffles have been widely used for years in applications as diverse as I.C.E. exhausts and petrol tankers.
The flexible flue is connected to the stub exhaust from the boiler and goes straight up to the exit point of the housing, if anything there is a fractional increase in the bore of the exhaust.
I cannot comment on the regulations as I have not read them. My experience is limited to manufacturers installation instructions, although, if you have a link or other information regarding Spanish gas regs I'd be interested to have a look.
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