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So we are looking at a new vaillant ecofit pure 418 regular boiler but have a question about the gas pipe size requirements..
At the gas meter the pipe size is 15mm where it then runs under the kitchen floor before exiting at the the other side where the existing boiler is located (old baxi) where the pipe size is 22mm. So somewhere under the kitchen floor it changes from 15mm to 22mm.
The old boiler has been working fine with this configuration but i am worried that new boilers require a 22mm pipe.
The new boiler will either be a Vaillant or another Baxi rated at 18kw as due to the position etc it has to have a rear flue....
One surveyor mentioned the 15mm pipe size may be ok but mentioned new pipework might be required if after the new boiler was fitted the flow rate wasn't sufficient. It will be an absolute nightmare to do this as the existing gas pipe runs under a kitchen floor that was only last year levelled with resin before new lino was stuck over the top....There is no obvious easy way to re-route.
The 15mm gas pipe that exits the meter we estimate runs for around 3-5 metres before the size changes to 22mm somewhere under the kitchen floor. It's probably around another 3metres to the boiler.
I read somewhere that the Vaillant has a 15mm connection, not sure if that matters.
As an after thought does anyone have any opinions on the vaillant ecofit pure 418 or the Baxi 418 Heat 18kW?
At the gas meter the pipe size is 15mm where it then runs under the kitchen floor before exiting at the the other side where the existing boiler is located (old baxi) where the pipe size is 22mm. So somewhere under the kitchen floor it changes from 15mm to 22mm.
The old boiler has been working fine with this configuration but i am worried that new boilers require a 22mm pipe.
The new boiler will either be a Vaillant or another Baxi rated at 18kw as due to the position etc it has to have a rear flue....
One surveyor mentioned the 15mm pipe size may be ok but mentioned new pipework might be required if after the new boiler was fitted the flow rate wasn't sufficient. It will be an absolute nightmare to do this as the existing gas pipe runs under a kitchen floor that was only last year levelled with resin before new lino was stuck over the top....There is no obvious easy way to re-route.
The 15mm gas pipe that exits the meter we estimate runs for around 3-5 metres before the size changes to 22mm somewhere under the kitchen floor. It's probably around another 3metres to the boiler.
I read somewhere that the Vaillant has a 15mm connection, not sure if that matters.
As an after thought does anyone have any opinions on the vaillant ecofit pure 418 or the Baxi 418 Heat 18kW?
