2
Pre-installation checklist
CombiBoost is suitable for two separate types of water boosting applications
1. Boosting the incoming mains water supply to a whole house
2. Boosting the inlet mains water supply solely to a combination (combi) boiler.
Points applicable to
either installation
type:
Do’s
• CombiBoost must be fitted to rigid fixed
pipework preferably with vertical inlet and
outlet
• Pipework above and below the pump must
be securely fixed to the wall
• Only one CombiBoost may be fitted per
household supply
• Ensure that installation complies with IET
Wiring Regulations
• Allow 100mm on all sides for ventilation
• Ensure pump is protected from frost
• Complete all hot work prior to
CombiBoost installation
• We recommend that the pump is activated
for at least five minutes every four weeks
• If the supply is known to be lime/calcium
(hard) water, fit extra filtration before the
pump. Always consult filter manufacturer’s
literature for correct installation.
Don’ts
• Never fit to hot water piping
• Never fit the pump to communal risers
• Never pump directly from or to another
pump – only one CombiBoost may be
installed per household supply
• Never fit to flexible pipework (e.g. tap
connectors)
• CombiBoost cannot be used on outside
coldwater storage tanks, bore holes or
wells
• Never use jointing compounds,
Boss White, hemp or steel wool
• Solder fluxes must not come into
contact with the pump
• Never fit to restrictive or collapsed
supply (eg lead main)
• Never fit CombiBoost upside down
Points applicable to
whole house
installation:
Do’s
• Install vertically or horizontally,
mounted on cold water mains inlet to
the house
• Locate the pump next to the mains
stop tap
• Pump should be fitted before ANY other
water outlets taken after the mains stop
tap. If any outlets are between the stop
tap and your CombiBoost, they must be
fitted with a non-return valve (NRV).
Points applicable to
combi-boiler
installation:
Do’s
• Install vertically or horizontally, mounted
on cold water mains inlet to the combi
boiler
• Locate the pump next to the combi-boiler
OR on it’s cold water mains inlet
• Pump must exclusively feed the combi-
boiler