4.24 In a new system, all of the following new pipework should be insulated.
a. Primary circulation pipes for heating circuits where they pass outside the heated living space, including where pipework passes into voids.
b. All primary circulation pipes for domestic hot water.
c. All pipes that are connected to hot water storage vessels, for at least 1m from the point at which they connect to the vessel.
d. All secondary circulation pipework.
4.25 In an existing system, when a boiler or hot water storage vessel is replaced, any accessible pipes in the dwelling should be insulated