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Turn a fixture on in the hot-water-only position prior to draining the water heater tank.

Turn a fixture on in the hot-water-only position prior to draining the water heater tank.
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Turn on power to the water heater from the circuit breaker.

Turn on power to the water heater from the circuit breaker.
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Types of heat pump water heaters commonly used in central heat pump water heating systems include single pass units, multi pass units, and integrated units

Types of heat pump water heaters commonly used in central heat pump water heating systems include single pass units, multi pass units, and integrated units
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Typical ground-source plumbed system

Typical ground-source plumbed system
Video:

University of Minnesota-NorthernSTAR: A Natural Gas-Fired Combi System for Space Heating and Hot Water

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Use a long stick lighter or incense stick to see if an ambient draft gas water heater is backdrafting

Use a long stick lighter or incense stick to see if an ambient draft gas water heater is backdrafting
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Use a non-contact voltage tester to verify the electricity is off, then disconnect the electrical and water connections of the old water heater tank.

Use a non-contact voltage tester to verify the electricity is off, then disconnect the electrical and water connections of the old water heater tank.
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Use a screwdriver to remove the front panel of a tankless water heater to access the air filter or other internal components

Use a screwdriver to remove the front panel of a tankless water heater to access the air filter or other internal components
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Use a square piece of insulation, secured with heat-resistant tape, to insulate the top of your electric water heater.

Use a square piece of insulation, secured with heat-resistant tape, to insulate the top of your electric water heater.
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Use a transfer pump to quickly drain a water heater for repair or replacement by attaching a clothes washer hose to the drain valve of the water heater and the other end to the inlet of the transfer pump, and using a garden hose from the pump to a drain.

Use a transfer pump to quickly drain a water heater for repair or replacement by attaching a clothes washer hose to the drain valve of the water heater and the other end to the inlet of the transfer pump, and using a garden hose from the pump to a drain.
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Use a water pressure gauge to check the house's cold water pressure at a garden hose spigot.

Use a water pressure gauge to check the house's cold water pressure at a garden hose spigot.
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Use an X-shaped cut to expose control panels when installing an insulation blanket on an electric water heater

Use an X-shaped cut to expose control panels when installing an insulation blanket on an electric water heater
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Use plumbers metal strapping, wood blocking, and shelving brackets to secure a water heater in a corner to prevent tipping during an earthquake.

Use plumbers metal strapping, wood blocking, and shelving brackets to secure a water heater in a corner to prevent tipping during an earthquake.
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Use strapping, wood blocking, and shelving brackets to secure a water heater to a straight wall to prevent tipping during an earthquake.

Use strapping, wood blocking, and shelving brackets to secure a water heater to a straight wall to prevent tipping during an earthquake.
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Use the dust brush attachment on your vacuum cleaner to clean the air filters of your heat pump water heater

Use the dust brush attachment on your vacuum cleaner to clean the air filters of your heat pump water heater
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Utility room floor plan showing solar hot water tank

Utility room floor plan showing solar hot water tank
Case Study:

Veridian Homes: Cold Climate Region 40+% Energy Savings

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Wall grilles installed high and low on the wall of the heat pump water heater closet allow passive ventilation of a small room with warmer air coming in at the top and cooler exhaust air exiting at the bottom of the wall

Wall grilles installed high and low on the wall of the heat pump water heater closet allow passive ventilation of a small room with warmer air coming in at the top and cooler exhaust air exiting at the bottom of the wall
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Wall-mounted gas tankless water heater

Wall-mounted gas tankless water heater
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Water Heater Buying Guide 2022 - Energy Star rating, price, fuel, rebates, etc.

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Water heater is elevated to a new location above the Base Flood Elevation

Water heater is elevated to a new location above the Base Flood Elevation
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Water heaters should be flushed about once a year to remove sediment in the tank and improve long-term performance.

Water heaters should be flushed about once a year to remove sediment in the tank and improve long-term performance.
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What is a Heat Pump Water Heater?

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When filling a water heater tank, open the cold water valve (on left) to begin filling the tank and turn on one or two faucets for hot water (right), allowing air to escape from the tank.

When filling a water heater tank, open the cold water valve (on left) to begin filling the tank and turn on one or two faucets for hot water (right), allowing air to escape from the tank.