Hi all. First post from a first time home owner, and very amateur DIY'er.
I've inherited an old Worcester Bosch highflow 3.5 combi boiler when i bought this house.
I'm needing to drain the system to give it a general clean, and to practice for fitting a new towel rail, and unblocking (or replacing) a section of 8mm micro bore to one of the rads, which isn't working properly.
The odd thing with this system is that it seems to have an expansion/header tank in the loft?
I've tried to drain it by turning off supply to the header tank, and opening the drain valve under the boiler - but nothing (not a drop) comes out.
It looks like the boiler is gravity fed, as I can't see any pressure gauges on the boiler itself.
Can anyone with any experience of these boilers point me in the right direction? Is there another valve I've forgotten about - or could it be an air lock or knackered drain valve?
Scuse the ignorance!
Cheers,
Nik
I've inherited an old Worcester Bosch highflow 3.5 combi boiler when i bought this house.
I'm needing to drain the system to give it a general clean, and to practice for fitting a new towel rail, and unblocking (or replacing) a section of 8mm micro bore to one of the rads, which isn't working properly.
The odd thing with this system is that it seems to have an expansion/header tank in the loft?
I've tried to drain it by turning off supply to the header tank, and opening the drain valve under the boiler - but nothing (not a drop) comes out.
It looks like the boiler is gravity fed, as I can't see any pressure gauges on the boiler itself.
Can anyone with any experience of these boilers point me in the right direction? Is there another valve I've forgotten about - or could it be an air lock or knackered drain valve?
Scuse the ignorance!
Cheers,
Nik
