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its a bit more complex then a simple 55c or less statement. its not a switch were all the water vapor will suddenly condense. the point will change with % co2/excess air. also it not really the return temp that is key. its the temp of flue gas that matters.... to cut a long story short...

use 20c as your boiler is designed for that temp rise over it.

what you really want is to rip up your floors :lol: a just as valid solution is to take your over sized boiler out and replace it with something smaller and will give you a much better flow through it. or place a second pump in series or fit a LLH or plate heat exchanger or even...

you need someone to have a good look at it. you are only going to get very general advice for here. the new set up will have to look at a whole host of stuff that just cant be explained on a forum. but to give you an idea we have just finished a small care home heating system, that was...

not really but still phone your installer or intergas. The boiler would lock out with fault code 4 or 5 if it was very badly out.

most likely one of two things if you have TRVs fitted to most of your rads you could be getting valve chatter. the TRVs vibrating the other one is the gas valve setting is out.

not bad, 480L/sec is about 1728 tons of water moved in an hour :roll: a 420L/sec would be a 17640kw boiler at 10c diff btw

i don't know WB very well(not a fan)does the boiler really only have 2 meters of spare head? is it really losing 4 meter in side the boiler? shh gaswizzard, let him rip up his floors :wink: :lol:

you don't add heatloss and coil capacities together because of diversity factors. most take heatloss + 2kw for the cylinder. cant see the job but i doubt you would see any difference between 22mm and 28mm.

achrn, forget for a sec you have a 30kw boiler. what is the heatloss of your house? what can your rads even output? upping the primary flow and return to 28mm may gain you nothing other than hassle.

you never know. system could have loads of ds-40(acid cleaner) floating about? all i know i come across loads of boilers that use this turd of heat exchanger which have started to leak. they must be cheap as chips to make for this design to still be kicking about...

yes ask him to range rate, also see if they can up the pump overrun(if he can)