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It could be one of the following:
Your Hot Water
Heater
There may be a fault
with the heating element, thermostat or tempering valve, if there is
one fitted.
It may be one of
the following if you have been experiencing problems on a "Regular
Basis":
1. The water heater
may not be of sufficient size for the household's needs.
Upgrading to a water
heater with a capacity more suitable to your requirements.
Installing flow
restrictors in the showers will substantially increase the amount of
hot water available.
Installing a
tempering valve will not only keep your hot water at a safe 120°F but
will extend the amount of hot water you have stored.
2. Excessive
discharge from the relief valves or leaking taps or plumbing.
Guests Staying
Extra load has been
placed on the hot water supply though guests staying.
An all too common
reason for a lack of hot water. If chosen and installed correctly,
domestic water heaters are suitable for most family situations but
will have difficulty providing for a high demand of hot water over a
short period of time, e.g., more than three or four showers
in 30 minutes. If guests are staying for an extended time then it
would be wise to think about how your hot water is used and work
around times of high demand.
The Power Supply
Your power provider
may have a problem with the power supply to your hot water cylinder.
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