About to have 30 years old open vent system replaced with Vaillant combi. One of the heating company bods providing quotes has indicated that the existing CH pipework (half buried in floor slab, other half in void beneath timber floors) should be replaced as the increase in pressure could result in leaks. Is this a valid point or a tactic to make the job a bit bigger than it needs to be?
My initial thoughts are to install the new boiler and see what happens when the system is commissioned.
Grateful for any comments based on experience.
-- rbel