I am fitting a bathroom at my brothers. I shut of the mains water, drained the tank and the put in my new supply for a bath. Only trouble is I cant get any hot water to come out of the taps( or any water for that matter!!) I have restored the mains supply and the tank is full and hot!! but nothing coming from the back boiler to the taps. Ps the CH is working ok too!! Help!

richard, August 2006

It is an airlock induced from draining the tank. The hot water is gravity fed in an open vent system so any air sucked in prevents the water getting to the tap. you basically close all the taps except for one and connect a hosepipe to it. Connect the other end of the pipe to the cold mains supply(tap) and blast the air back through the system until the airlock pops out into the water tank tank in the loft. You can tell when its out because the hot water supply will return to the taps, spitting any residual small air pockets out.

richard, August 2006