What are the heat traps, installation tips, and problems that can affect comfortable water heating?
Heat traps are elements installed on the electric and gas powered water heaters and are used to prevent heat loss from inside the storage tank when the flow stops while increasing the overall efficiency.
The heat energy is lost through the thermal expansion when hot water from the storage tank rises through the cold water inlet (dip tube) and out through the plumbing.
This is also known as natural convection and thermosiphoning. The process of heat dissipation can be tested by touching the cold water inlet, and if it feels warm or hot, the thermosiphoning is in action. That means either the water heater does not utilize the heat traps, heat traps are broken or improperly installed.
Most tank-type water heaters today, Rheem, AO Smith, State, American, Bradford White, and others, are equipped with the two heat traps (hot and cold pipes) to increase the energy efficiency, while those without, can be retrofitted. The most used types are with the metal nipples with the flaps or balls inside. The heat traps with the flaps are better due to the smaller size and quiet heater’s operation, while the ball type can usually get stacked and reduce water flow.
Some plumbers prefer making the heat traps by bending the pipes into U-shape, also known as a gooseneck. The most frequent problems related to the heat traps are the flow restriction, lack of hot water and noise, especially if you have a recirculation loop. Shaping the pipe into gooseneck have its advantages over the factory installed one; there are no moving parts that can get stuck and reduce the water flow.