Thank you for the explanation. Is it fairly expensive to upgrade to a two pipe system from a one pipe, especially if you are also upgrading to a combi boiler?
Thanks for the question. The cost would vary by property, number or rads/lengths of runs etc. Worth noting that changing to a combi isn’t necessarily an upgrade as they have a limited flow rate (it takes a LOT of energy to heat water). Whether a combi is right depends on the amount of hot water you’d need.
Water would only be pumped round the pipe not through the radiators. It travels into/through the radiators via convection and you wouldn't want anything to slow this down, so locksheilds should be fully open. You would need to oversize later radiators to allow for the heat loss from earlier radiators.
Thank you for the explanation. Is it fairly expensive to upgrade to a two pipe system from a one pipe, especially if you are also upgrading to a combi boiler?
Thanks for the question.
The cost would vary by property, number or rads/lengths of runs etc.
Worth noting that changing to a combi isn’t necessarily an upgrade as they have a limited flow rate (it takes a LOT of energy to heat water).
Whether a combi is right depends on the amount of hot water you’d need.
On a one pipe system with radiators in series, would it be necessary to balance the system via the lock shield valve on each radiator,?
Water would only be pumped round the pipe not through the radiators. It travels into/through the radiators via convection and you wouldn't want anything to slow this down, so locksheilds should be fully open. You would need to oversize later radiators to allow for the heat loss from earlier radiators.
Would you use 1/2 inch pipe to radiators
Normally it’s 15mm, but some rads might be 8mm or 10mm.