7
8. Check the marker arrows on the pump to ensure correct direction of water flow.
Either end of the pump is suitable for hot or cold water.
9. Check the static inlet pressure does not exceed 10m max (1.0bar/100kPa) of water
above the pump.
10. The hot supply pipework to the pump should be a maximum length of 5 metres in 22mm pipe
(hot and cold supplies should be no more than 2 metres in 15mm pipe).
11. The best hot connection from the cylinder (Figure 5) is either with:
A
¾
inch no stop Essex flange, or a Salamander S flange or other approved top entry flange.
12. Exceptions, only when pump is at the base of the cylinder and within 5m, are:
• alternatively, the hot and cold supplies to the pump can be teed off other 22/28mm
supplies (Figure 4) provided that:
• the tee off to the pump is first call on the downward leg after the vent connection.
• the cold supply to the pump is not shared with the cold feed to the cylinder.
• hot supply from the vent angled at 45º, vertically down the hot connection at the vent,
at least 1.5 metres below the base of the cold water storage cistern.
13. Check that water storage capacity recovery meets required flow rates, particularly at peak
demand (i.e. appliances in simultaneous use).
14. All up and over pipework must be vented at the highest point on the outlet of the pump.
15. Ensure that pipe runs minimise airlocks.
16. In positive head systems, allow for increased resistance of long pipe runs with multiple bends.
The natural flow from the shower head or other outlets must be at least 2 litres/minute at all
time on both hot and cold individually. Any supply where the natural flow is less than 2litres/
minute is classed as a negative head situation.
Cold water storage
Inlet
Outlet
Inlet
Outlet
Usable capacity
Minimum 50 gallons
per bathroom
600mm or
less possible
negative head
Positive head
Other
supplies
Vent
Other services
MAX
60°C
MAX
60°C
1st tee off
downward leg
Figure 4. Tee off other supplies
*Vent and expansion pipe to terminate to current standards
*
A Salamander S flange or one
of the 22mm approved top entry
flanges (see page 14)
22mm No Stop Essex flange with
76mm dip pipe and birds beak cut
end to limit air being drawn into
the pump
Indirect coil
Pump inlet
Outlet
OR ALTERNATIVELY
Pump at the base of cylinder
MAX
60°C
Figure 5. Best Connection Method