Hot Water Storage Tanks and Heaters Flashcards
Domestic hot water tanks have a thermostat control setting of?
140F
60 C
Every hot water tank (of a storage type) must be equipped with a T&P valve located within_______ mm/in. from the top of the tank
150 mm 6in
Cold water supply to a hot water tank must be equipped with a
______
stop valve
What advantage does an electrically heated water tank have over fire heated water tank
___________
larger tanks
What advantage does a fuel heated water tank have over electrically heated water tank
_______________
High recovery rate
Domestic hot water tank is an integral part of a plumbing system. Which requirements of the plumbing code does it have to meet?
-quality of the tank
- termination of a drain pipe from the T&P valve
- pressure requirements
What is the main purpose of a commercial hot water tank?
store large quantities of water
A water heater that is installed in a water storage tank to heat the water is called __________
direct water heater
What is the main reason for a domestic hot water circulating system?
instant hot water at the taps
Hot water heaters ,with it’s cold water supply entering at the top, supplies cold water to the bottom of the tank by means of a _____________
dip tube
a rod installed in a water heater to retired corrosion is made of ___________
Magnesium
What does that mean if water is released when the lever is lifted on a water heater t/p valve?
the valve is functioning normally
in a parallel HWH connection, the length from the feed line to the first Tank’s cold water inlet is equal to 150 mm. to ensure proper operation, the feed Line to the tanks cold water inlet must be a length of_____mm
75
when water heaters preheat the water in one tank to supply a second tank, where the water is brought to its final temperature and this type of installation is known as ________
series connection
An electric water heater heats water with one or more ________
Elements
the upper immersion heater is also known as
booster heater
the circulation of heated water inside a HWH storage tank is done by currents called
Convection
to protect a HWH storage tank against corrosion, the inside of the tank has a protective coating of galvanized, stone or ____
Glass
when a boiler heats domestic hot water above 140° F, it is recommended that a ______ be used
mixing valve
hot water entering into drainage system must be cooled to _____ degrees Celsius
75° C
