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Image:

A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance.

A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance.
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A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi-pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance

A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi-pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance
Image:

A central heat pump water heating system with a temperature maintenance swing tank configuration uses the water from the primary storage tank to provide most of the heat for hot water circulation temperature maintenance

A central heat pump water heating system with a temperature maintenance swing tank configuration uses the water from the primary storage tank to provide most of the heat for hot water circulation temperature maintenance
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A demand plumbing layout uses a recirculation pump to speed delivery of hot water to plumbing fixtures.

A demand plumbing layout uses a recirculation pump to speed delivery of hot water to plumbing fixtures.
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A high-efficiency gas boiler provides hot water to the faucets, to radiant heating loops in the basement floor, and to a hydro-coil for a central air heating system.

A high-efficiency gas boiler provides hot water to the faucets, to radiant heating loops in the basement floor, and to a hydro-coil for a central air heating system.
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A planted “green” roof absorbs storm water runoff.

A planted “green” roof absorbs storm water runoff.
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A premade gasket seals out air leaks around the water line.

A premade gasket seals out air leaks around the water line.
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A push button operates the on-demand hot water circulation pump in this master bathroom.

A push button operates the on-demand hot water circulation pump in this master bathroom.
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A water softener collects water, filters it to remove minerals, and then sends it to the home's plumbing distribution system

A water softener collects water, filters it to remove minerals, and then sends it to the home's plumbing distribution system
Video:

Air Admittance Vents

CAD File:

Air seal at chase walls - plan

Preview Image
Air seal at chase walls - plan
CAD File:

Air seal at top plate pipe penetration

Preview Image
Air seal at top plate pipe penetration
CAD File:

Air sealing at skylight shaft

Preview Image
Air sealing at skylight shaft
Video:

Air Sealing Retrofits: Conducting an IR Camera Inspection of an Existing Home - Skylights

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Air-seal around all plumbing and piping installed through walls, ceilings, and flooring adjacent to unconditioned space to prevent air leakage.

Air-seal around all plumbing and piping installed through walls, ceilings, and flooring adjacent to unconditioned space to prevent air leakage.
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All components of the recirculation system should be included in the plumbing layout.

All components of the recirculation system should be included in the plumbing layout.
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All of the pipes are insulated on this high-efficiency 50-gallon heat pump water heater.

All of the pipes are insulated on this high-efficiency 50-gallon heat pump water heater.
Video:

Andy Roe Describes the Ground Source Heat Pump at Weller Elementary

Image:

Basic components of a gas tankless water heater include a high-powered burner, fan, and heat exchanger; condensing gas water heaters also have a secondary heat exchanger and a piped air intake to the sealed combustion chamber

Basic components of a gas tankless water heater include a high-powered burner, fan, and heat exchanger; condensing gas water heaters also have a secondary heat exchanger and a piped air intake to the sealed combustion chamber
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Basic components of a skylight

Basic components of a skylight
Case Study:

Building America Case Study: Assessment of a Hybrid Retrofit Gas Water Heater

Case Study:

Building America Case Study: Indoor Heat Pump Water Heaters During Summer in a Hot-Dry Climate, Redding, California

Case Study:

Building America Case Study: Side-by-Side Testing of Water Heating Systems: Results from the 2013–2014 Evaluation Final Report

Case Study:

Building America Case Study: Simple Retrofit High-Efficiency Natural Gas Water Heater Field Test, Minneapolis, Minnesota