When investigating a problem (some radiators seeming to not work) in my Central Heating system I found some flexible hose used.
An 8 metre channel runs in a straight and level line under the floor, in this channel are 4 22mm pipes.
Each pipe has in its middle a flexible connector...
Some of my radiators are only tepid. Flow side of radiators is Hot and return is Cold.
Water Heating working fine.
Near Boiler CH system has a T-Junction in Pipework - All radiators on one side of the T seem fine.
On the other side of T first radiator seems to heat fine. but subequent...