Changed the title of the thread.... You are free to discuss boiler operating....etc...
you see this is the thing ,a gas rate is required by law now .if as suggested earlier that someone hangs a boiler and fires it up i gaurantee it will be overfiring if someone wants to post a boiler make and kw and the manufacturers stated m3ph i will do the calculation and show you how its overfiring -
based on what studies, what are your gas qualification(apart from GID) and what have you studied to come to this opinion(apart from Mr Hogan).
in the case of the above boiler, you install it and check you have the required 20mb at the inlet. no further adjustment of gas pressure is allowed as the valve is sealed.
how do you propose to correct the overfire situation you believe to exist here?
me up for learning
The baxi solo HE is the same, and there are a few others where there is no adjustment. If you find a problem with appliance firing etc when commissioning it, you would have to make a service call.
Don't go mixing up a real ignition or combustion issue with a made up over firing issue.
I mean, if co2 readings are out or gas rate too high or low.
Here are some facts:
1) The higher the C.V the more a supplier can charge(so ours is high because?)
2) A gas boiler shall be gas rated on commissioning.
3) you can only commission asper the manufactures instructions and none allow for the adjustment of the gas isolation valve
5) you can't adjust the gas rate on a condensing boiler other than the adjustment allowed by the manufactures on some gas valves to set correct co2. adjusting the gas inlet valve may put the working pressure at the appliance below the required amount specified in IS813 5.4.5.
6) The manufactures write different instructions for different countries so the values can change in the manuals although the boilers stay pretty much the same.
7) To date in this country no gas boiler made by my firm has had a issue with the high CV given by Bord Gais.
8) When designing and making appliances, manufactures use the European average calorific value which is 10.8 kWh/m3 as a starting point and not the UK CV value.
This is why i orig closed the thread. No 3 was my understanding...
ps... you forgot 4.
A stainless steel heat exchanger is the only way to go Joey. The best corrosion resistance, and minimizes deposit build up due to having a smooth surface.
I like that but are they interchangable.. For example if i buy a make of boiler can i go off and buy a stainless steel heat exchanger.