27
Amount of Hot Water
Problems What to do
Display Window
The amount of hot water
at a certain xture is not
constant.
When hot water is demanded at other xtures, the
amount available may be reduced.
The maximum ow available
is 4.9 GPM (18.7L/min.)
at a 45°F (25°C) temperature rise.
Pressure uctuations and other plumbing conditions
can cause the temperature and pressure at a xture to
be unstable, but it should stabilize after a short time.
There are some types of hot water taps that discharges
large volumes of hot water at rst but stabilize after time.
To keep the temperature stable, the heater limits the
amount of water that can ow through it to a low ow
initially, but the amount increases over time.
[Using the optional remote controller]
The amount of hot water in
the tub is less/more than the
set amount when using the
ow meter alarm feature.
When hot water is used for other xtures while lling
the bath tub, the tub will not ll as much.
If there is water in the tub already, or when lling is
stopped and restarted, the tub will ll more.
[Using the optional remote controller]
The ow meter alarm does
not sound even when lled
to the set amount.
The ow meter alarm is set to sound when hot water is
continuously discharged for the set volume of water.
If mixing valves are used, or if cold water is mixed
with hot water at the xture, the tub will ll more than
the setting of the ow meter alarm.
Amount of hot water
available has decreased
over time.
Is the water lter clogged? (page 22)
If the supply water is hard and has not been treated,
scale can build-up in the water heater and decrease
the maximum amount of hot water available. Scale can
be removed from the water heater by ushing the unit
periodically. To prevent scale from forming in the water
heater, a water softener or scale inhibitor is recommended.
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