To increase flue gas heat transfer efficiency in a direct hot water heater a ____________ is used:
a) induced draft fan
b) Insulation jacket around tank
c) spiral baffle
d) butterfly backflow valve
e) all of the above
Answer: C
To increase flue gas heat transfer efficiency in a direct hot water heater a ____________ is used:
a) induced draft fan
b) Insulation jacket around tank
c) spiral baffle
d) butterfly backflow valve
e) all of the above
Answer: C