Are gravity hot water systems (as per the first diagrma in the link below) more prone to airlocks?
http://www.diyhowto.co.uk/projects/open-vented-heating.htm
After years of working fine, a friends gravity hot water system has become airlocked twice in a month.
The first time this happened, the plumber released air from the system by removing a pipe from the cylinder. The second time, the plumber simply turned up the thermostat on the boiler. I guess this will increase the convection rate and so flow through the pipes ot the cylinder.
Is there any likely issue that might cause this to start happening?
Cheers,
iep
http://www.diyhowto.co.uk/projects/open-vented-heating.htm
After years of working fine, a friends gravity hot water system has become airlocked twice in a month.
The first time this happened, the plumber released air from the system by removing a pipe from the cylinder. The second time, the plumber simply turned up the thermostat on the boiler. I guess this will increase the convection rate and so flow through the pipes ot the cylinder.
Is there any likely issue that might cause this to start happening?
Cheers,
iep