I am going to install a new bath into a system which is fed by a combi boiler. Is there anything I need to do to the system before I start disconnecting hot water pipes? ie shut valves depressurise or anything!
Is this just a like for like swap in existing bathroom, if it is then see as follows.
Unless there are isolation valves on the existing pipework under the bath, then open hot & colds taps in bathroom & kitchen. Then close off stock cock, on combis this shuts off hot & cold water. Remove old bath cut pipework and fit isolation vales to hot & cold supplies, this then means you can restore mains supply to boiler and have hot & cold water / heating in rest of house while you are working in the bathroom.
If your lucky you will have a couple of service valves under your bath on the hot and cold supplys, these are an inline valve with a screwdriver slot in, simply turn off there and thats all you need do, if no service valves under bath, turn off your stop tap, crack downstairs taps to remove pressure on hot and cold, remove bath buy some service valves install inline and you can then turn water back on and fit your bath without upsetting the rest of the water supply to your house.