Boiler location and clearances

This boiler is only suitable for installing internally within a property at a suitable location on a fixed, rigid non-combustible surface of at least the same size as the boiler and capable of supporting the boiler weight.

Compartments: Follow the requirements of BS 6798 and BS 5440 Part 2 and note:

• Minimum clearances must be maintained.
• An access door is required to install, service and maintain the boiler and any ancillary equipment.
• If fitting the boiler into an airing cupboard use a non-combustible perforated material (maximum hole sizes of 13mm) to separate the boiler from the airing space.

Unvented compartment clearances

The diagram shows the minimum space required to install and service the boiler inside an unvented compartment.

Airing cupboard clearances

The diagram below shows the minimum space required to install and service the boiler within an airing cupboard.

Venting compartments

If the clearances are less than those stated for the options above then ventilation must be provided as described in BS 5440.

A minimum of 2 air vents (A) must be fitted, one at low level and another at high level onto the same wall using the same air for circulation.

Minimum free air required for venting:

• For air directly from outside:

440CDi 155cm² per vent

550CDi 220cm² per vent

• For air from internal space/room:

440CDi 310cm² per vent

550CDi 440cm² per vent

Bathrooms

Important: Any switch or appliance control using mains electricity must not be within reach of a person using the bath or shower.

Electrical switches, fused spurs and socket outlets must not be situated in the bathroom.

A boiler fitted with a non-mechanical timer or with no timer can be installed in zone 2 or outside the shaded area.

A boiler with a mechanical timer or RF mechanical timer with a room thermostat must only installed outside the shaded area.

Additional Residual Current Device (RCD) protection may be required.

Refer to the latest IEE wiring regulations.