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The valve for the cold-water inlet pipe is a lever-style valve located up high; if there's an expansion tank, it is connected to the cold water line and the valve is typically upstream of the expansion tank (connected here by white horizontal pipe).

The valve for the cold-water inlet pipe is a lever-style valve located up high; if there's an expansion tank, it is connected to the cold water line and the valve is typically upstream of the expansion tank (connected here by white horizontal pipe).
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The very high efficiency (4.7 COP) ground-source heat pump provides hot water to a tank for radiant floor heat and domestic hot water.

The very high efficiency (4.7 COP) ground-source heat pump provides hot water to a tank for radiant floor heat and domestic hot water.
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The wall hung boiler provides heat for the central air handler as hot water.

The wall hung boiler provides heat for the central air handler as hot water.
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The water heater and other appliances are located above the Base Flood Elevation.

The water heater and other appliances are located above the Base Flood Elevation.
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The water heater tank can drain to a floor drain (left) or the yard or curb drain (right).

The water heater tank can drain to a floor drain (left) or the yard or curb drain (right).
Video:

The Weather Channel - Protecting Openings

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The white arrows indicate the location of the air filters in two different tankless water heaters.

The white arrows indicate the location of the air filters in two different tankless water heaters.
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Thermosiphon solar hot water system

Thermosiphon solar hot water system
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Thermosyphon solar hot water heater (commercial application).

Thermosyphon solar hot water heater (commercial application).
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This ambient-drafted gas water heater has backdrafted in the past or is actively, as indicated by melted plastic rings around the gas pipes and soot spots on top of the tank; backdrafting brings dangerous carbon monoxide into the home.

This ambient-drafted gas water heater has backdrafted in the past or is actively backdrafting, as indicated by the melted plastic rings around the gas pipe and soot spots on the top of the tank; backdrafting brings dangerous carbon monoxide into the home.
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This asphalt-based, vapor-permeable coating is painted directly onto the OSB sheathing to provide a weather-resistant barrier that also reduces air leakage.

This asphalt-based, vapor-permeable coating is painted directly onto the OSB sheathing to provide a weather-resistant barrier that also reduces air leakage.
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This bathroom exhaust fan includes a fan and light

This bathroom exhaust fan includes a fan and light
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This bathroom exhaust fan needs to be cleaned

This bathroom exhaust fan needs to be cleaned
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This building foundation has a drainage layer located on the exterior of the waterproofing membrane.

This building foundation has a drainage layer located on the exterior of the waterproofing membrane.
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This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a multi pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance

This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a multi pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance
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This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a single pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance

This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a single pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance
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This cold-water inlet valve has a wheel-style handle. It is closed by turning the wheel clockwise.

This cold-water inlet valve has a wheel-style handle. It is closed by turning the wheel clockwise.
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This exhaust fan duct opens into the attic rather than exiting through the roof and mold has begun to form on the underside of the deck sheathing and on the rafter due to the moist air exiting the duct

This exhaust fan duct opens into the attic rather than exiting through the roof and mold has begun to form on the underside of the deck sheathing and on the rafter due to the moist air exiting the duct
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This farmhouse was retrofit by removing the existing siding and adding taped insulated sheathing and battens before installing new siding

This farmhouse was retrofit by removing the existing siding and adding taped insulated sheathing and battens before installing new siding
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This flue pipe is sloping down rather than up so flue gases are likely to back up rather than exiting out of the house; this is a dangerous situation, call a plumber to make repairs as soon as possible.

This flue pipe is sloping down rather than up so flue gases are likely to back up rather than exiting out of the house; this is a dangerous situation, call a plumber to make repairs as soon as possible.
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This fully packaged/skid-mounted central heat pump water heating system was shipped to the building on a truck and craned into location

This fully packaged/skid-mounted central heat pump water heating system was shipped to the building on a truck and craned into location
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This fully specified central heat pump water heating system has four individual outdoor heat pump units plumbed in parallel to indoor storage tanks

This fully specified central heat pump water heating system has four individual outdoor heat pump units plumbed in parallel to indoor storage tanks
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This gas water heater flue pipe is disconnected; this is a dangerous situation allowing carbon monoxide and other combustion emissions to escape into the home; call a plumber to make repairs as soon as possible

This gas water heater flue pipe is disconnected; this is a dangerous situation allowing carbon monoxide and other combustion emissions to escape into the home; call a plumber to make repairs as soon as possible
Video:

This Heat Pump changes EVERYTHING | R290 Heat Pump