Tankless Water Heater Closed Loop System

Above the air handler is a smaller box containing the cooling coil.

Tankless water heater closed loop system.

Tips when installing a tankless recirculation system. A closed water heater system means that the hot water cannot expand beyond the valves and mix with the municipal water. The valves that are usually found in the closed systems are the check valve pressure reducing valve mixing valve backflow preventer and other. Timed operation is recommended over an aquastat with the timer programmed to recirculate in early morning and evening when demand for hot water is greatest.

Water heated by the tankless heater flows directly through the floor tubing while a heat exchanger provides heat for the dhw supply. However doing so in a way that doesn t waste a lot of energy is a little trickier. The advantages of a continuously active heat exchanger loop are twofold. Closed loop radiant heating systems are the more preferred option for most plumbers but are also more expensive due to the need for a secondary heating unit to be installed for optimal heating purposes.

The author s radiant distribution system consists of a primary loop with a heat exchanger for domestic hot water and secondary loops for each heating zone. A continuously operating pump is clearly wasteful. Water boiler a boiler is used to heat just the water as it boils the water and turns it to steam. These systems are typically connected to a source that s heats the water such as a boiler or a tankless water heater in which the heating.

This is called a closed loop heating system with domestic water. They are either a tank or tankless style and can be gas or electric. This space heating system is a hydro air system using a rheem tankless water heater seen on the left. Creating the loop is fairly easy.

Minimize the length of the run from the tankless water heater to the recirculation loop maximum 5 recommended. Whenever needed the storage tank draws heat from the heat exchanger and maintains a constant tank temperature. Actual layouts vary from job to job. The box on the floor lower right is an air handler that includes a copper heat exchange coil.

This is an example of how to set up a tankless water heater as a heat source and for your domestic hot water. The tankless water heater also provides domestic hot water. A hot water loop uses a small pump to circulate hot water between a water heater and a distant bathroom or kitchen. These are for closed systems usually called hydronic systems and they are just for heating.

Insulate all hot water pipes to minimize standby energy loss. This is only an example.