We are WPJ Heating, a Gas Safe registered plumbing and heating company in South West
London. If you’re looking to install a boiler in your bathroom, we have some advice for you. We
regularly perform new bathroom installations and see the bathroom becoming a popular choice
for the location of new boilers.
This is particularly true for properties that change over from a traditional tank and cylinder
system to a new mains pressure combination boiler one. The old airing cupboard or position of
the hot water cylinder is often chosen as the new boiler location as many of the necessary pipes
are already there.
Regulations when installing a boiler in a bathroom
When siting a boiler in a bathroom there are some important regulations to observe, though.
The position must allow for the boiler flue to exit the building and terminate safely and the
location must provide adequate space for servicing the boiler. It is also important that there is
enough air circulation around the boiler when placing the boiler in a cupboard. All these
dimensions will be listed in the manufacturer’s installation instructions and can vary from boiler
Particular attention must be paid to the regulations regarding electrics. The bathroom is divided
into zones governed by the proximity of taps, showers, and any water.
Zone 0 is the area inside a bathtub or the shower tray.
Zone 1 is the area above zone 1 to a height of 2.25m from the floor.
Zone 2 is an area stretching 0.6m outside the perimeter of the bath and to a height of 2.25m
from the floor.
Zone 3 is anywhere outside zones 0,1 and 2 (subject to specific limits) and where no water jet is
likely to be used.
Where can boilers go?
When installing a boiler in a bathroom the boiler needs to be installed outside of zone 0, 1 and
2. The appliance must not be reachable from a bath or shower as wet hands and certainly
electricity don’t mix! The main electrical spur must be outside of the bathroom and the boiler
should generally be housed in a cupboard with a proper closing door so that it is shielded from
spray, mist and damp. If in any doubt, please refer to the relevant Building Standards and the
This article was offered by WPJ Heating, experts in boiler installation in bathrooms.