Regal 53 SC Owner's Manual page 139

Systems
Hot Water Heater
Your yacht offers a hot water heater (240 volts) which is
controlled by the generator at sea or shore power while at
dockside. Like home water heaters the unit uses a T and
P valve which protects the hot water tank from excessive
pressure due to overheated hot water. Should this occur
the valve would open and direct steam through a hose
overboard.
Also, there is a one-way valve that keeps the hot water from
back fl ushing into the cold water supply. The hot water
heater incorporates a drain valve to purge the system of
mineral deposits.
HOT WATER OUT
COLD WATER IN
T&P VALVE
DRAIN HOSE
HOT WATER TANK
WARNING
!
TO PREVENT HOT WATER HEATER DAMAGE!
NEVER ACTIVATE THE BREAKER
WHEN THE HOT WATER HEATER
IS NOT FULL SINCE
THE ELEMENT WILL BE DAMAGED!
87