Skip Navigation to main content U.S. Department of Energy U.S. Department of Energy Energy Efficiency and Renewable Energy
Bringing you a prosperous future where energy is clean, abundant, reliable, and affordable EERE Home
A Consumer's Guide to Energy Efficiency and Renewable Energy
Your HomeYour VehicleYour WorkplaceProducts and ServicesRenewable EnergyInformation ResourcesHome
Your Home
Apartments Appliances and Electronics Designing and Remodeling Electricity Energy Audits Insulation and Air Sealing Landscaping Lighting and Daylighting Space Heating and Cooling Water Heating Water Heater Selection Energy-Efficient Water Heating Drain-Water Heat Recovery Hot Water Use Hot Water Pipe Insulation Storage Tank Insulation Water Temperature Heat Traps Timers Meter Reading Swimming Pool Heating Windows, Doors and Skylights
Learn More

Professional Services

Calculators and Evaluation Tools
Bookmark and Share Printable Version

Install Heat Traps on a Water Heater Tank for Energy Savings

Illustration of pipes on the top of a water heater with two heat traps installed, one in the hot water line and one in the cold water line. The heat traps look like small cylinders installed on the end of the pipes. Inside the heat traps are balls that either float or sink to stop convection.

If your storage water heater doesn't have heat traps, you can save energy by adding them to your water heating system. They can save you around $15–$30 on your water heating bill by preventing convective heat losses through the inlet and outlet pipes.

Heat traps—valves or loops of pipe—allow water to flow into the water heater tank but prevent unwanted hot-water flow out of the tank. The valves have balls inside that either float or sink into a seat, which stops convection. These specially designed valves come in pairs. The valves are designed differently for use in either the hot or cold water line.

A pair of heat traps costs only around $30. However, unless you can properly solder a pipe joint, heat traps require professional installation by a qualified plumbing and heating contractor. Therefore, heat traps are most cost effective if they're installed at the same time as the water heater. Today, many new storage water heaters have factory-installed heat traps or have them available as an option.

Related Information