Hot Water Heating And Recirc

Question 1

Three methods of hot water production in residential application?

Answer 1

1) electric
2) gas
3) indirect

Question 2

What are two advantages of An electric or water heater

Answer 2

1) quiet

2) put it in anywhere

Question 3

What is a disadvantage of an electric water heater

Answer 3

Slow recovery rate

Question 4

What are the two different types of gas hot water heaters

Answer 4

1) Director fired stored water heater

2) Instantaneous water heater

Question 5

Type of baffle is used in a flu and why

Answer 5

A helix baffle and to get better heat transfer

Question 6

Advantage of direct fired hot water heater

Answer 6

Fast recovery rate

Question 7

Disadvantage of instantaneous hot water heater

Answer 7

A large Input rating required

Question 8

What is the recommended temperature for average domestic use

Answer 8

60°C

Question 9

Two basic methods for preventing high temperature hot water tank are

Answer 9

Eliminating source of heat and admitting cold water into the tank and discharging hot water

Question 10

What temperature does a feasible plug melt at

Answer 10

212°F

Question 11

What is max working pressure at fixture

Answer 11

550 K PA

Question 12

What is the minimum airgap required on a lavatory

Answer 12

1 inch