[Taf]

Next door has the same boiler as us, but it's in the upstairs landing airing cupboard, feeding a hot tank next to it. It often fails to run because they draw water so quickly out of the tank that the inflow can't refill the system in time. This causes airlocks which result in a lot of banging noises and hot water squirted out of the overflow pipe into their garden, followed by shut down as the system detects low water levels.