Water Connections - Elwa HOTRUN-VE 38VE Operating And Installation Instructions

1. The HOTRUN-VE range of products need a cold water supply pressure of at least 60kPa.
This 60kPa pressure must remain under full flow conditions. When connecting the
HOTRUN to a low pressure tank/rainwater system without pressure pump, it is unlikely to
switch on in a reliable manner. If unit is supplied by rain water, water must be filtered
before passing the HOTRUN water heater. The minimum supply pressure needs to be
secured at all times or the HOTRUN can fail to switch on.
The minimum flow rate to operate the HOTRUN-VE models depends on the model:
HOTRUN MODEL :
Min start-up flow rate:
Standard delivery flow rate:
2. The maximum inlet water pressure needs to be limited to 600kPa. If it is not guaranteed
the pressure will not exceed 600kPa a pressure limiter of 350kPa or 500kPa needs to be
installed in the total cold water supply to the building or the area where the HOTRUN will
be installed.Take water hammer of flick-mixers into consideration that can cause pressure
boosts, when closing fast, of up to 200kPa on top of the inlet water pressure.
3. Make sure that any flow restrictors in shower heads and aerators in tap outlets installed
after the HOTRUN are not too restrictive, kept clean and make sure these cause minimal
back-pressure to enable the HOTRUN to switch on and off. The outlet back-pressure
needs to be less than the cold water inlet supply pressure, as the cold water can be pushed
back to the HOTRUN when mixing cold water to the hot water and cause the HOTRUN to
switch off. Sometimes a pressure limiter in the total cold water supply needs to be
installed to secure proper performance at all times.
4. Connect the incoming & outgoing water pipe-work to the HOTRUN water connectors
only with the flexible hoses that are supplied with each HOTRUN, unless the water
connections come in from the back through the wall. All HOTRUN fittings and flexible
hoses are Watermark approved and have a flat sealing connection. By using the supplied
flexible hoses you will avoid excessive tension on the HOTRUN fittings. Damaging
internal copper pipework during installation is not covered by warranty.
5. The incoming and outgoing water connections for cold and hot water can't be swapped.
The fitting with the blue marking is for the cold water inlet and the one with the red
marking is for the hot water outlet.
6. Always use a ½˝ BSP (100% bore) ball valve on the cold water supply for service
purposes.
7. Important: After installation open the water tap to flush the device to release all air
from the Heat Exchanger and check all connections. Failing to do so shortens the
life-span of the electric elements. Replacement of elements burning out during
installation is not covered by warranty.
38VE 48VE
1.5 l/min 1.8 l/min
2.0 l/min 3.0 l/min

Water connections

60VE 75VE
2.2 l/min 2.9 l/min
4.0 l/min 5.0 l/min
96VE
3.8 l/min
6.0 l/min