The most effective water heater
a. is an electric water tank
b. is a gas water heater
c. is an oil water heater
d. is a tankless instant water heater fired by natural gas
e. is a propane water heater
Answer: D
The most effective water heater
a. is an electric water tank
b. is a gas water heater
c. is an oil water heater
d. is a tankless instant water heater fired by natural gas
e. is a propane water heater
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.