1. HOT WATER HEATERS 8/24/2014 1

2. Hot Water Heater Components Hot water heater components: Anode rods Cold water shut-off valve Inlet, dip tube and outlet Relief valve and extension Operating controls and thermostat Drain valve 8/24/2014 2

3. Gas Fired Water Heaters When a faucet is turned on, hot water is forced up in the heater as cold water enters and flows down through the dip tube Thermostat reacts to the resulting temperature drop by opening a valve that sends gas to the burner Gas is ignited by either a pilot light or an electric ignition spark Hot gases vented through flue and heat-retaining baffle to the draft hood andvent pipe 8/24/2014 3

4. Gas Supply From Thermocouple Pilot Supply Gas Line Burner Supply Gas Line 8/24/2014 4

5. Oil Fired Water Heaters Separate oil-fired hot water heaters represent less than 1 % of water heaters in the United States Typical units can heat a tank full of cold water about 3 times faster than gas heaters and about 5 times faster than electric heaters 8/24/2014 5

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7. Electric Water Heaters Electric water heaters usually have two heating elements controlled by thermostats that can sense water temperature through the tank wall To limit demand on the house electrical supply, the thermostats allow only one element at a time to heat 8/24/2014 7

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9. Indirect Fired Hot Water Heaters/ Storage Tanks An indirect water heater uses the boiler to heat a fluid that's circulated through a heat exchanger in the storage tank The energy stored by the water tank allows the boiler to turn off and on less often, which saves energy 8/24/2014 9

10. Direct Vent No electrical power necessary Horizontal vent terminal uses outside air to support combustion and exhausts to the outside For this model, optional vent kit allows up to 8` horizontal or vertical venting extensions 8/24/2014 10