Tankless Water Heater Closed Loop System

The tankless water heater also provides domestic hot water.

Tankless water heater closed loop system. The water from the boiler to this heat exchanger flows 24 hours a day in a closed loop making the heat exchanger continuously active i e. Insulate all hot water pipes to minimize standby energy loss. Water heated by the tankless heater flows directly through the floor tubing while a heat exchanger provides heat for the dhw supply. This space heating system is a hydro air system using a rheem tankless water heater seen on the left.

These are for closed systems usually called hydronic systems and they are just for heating. The valves that are usually found in the closed systems are the check valve pressure reducing valve mixing valve backflow preventer and other. Actual layouts vary from job to job. 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.

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. Tankless water heater as a heat source with domestic hot water. This is called a closed loop heating system with domestic water.

Whenever needed the storage tank draws heat from the heat exchanger and maintains a constant tank temperature. The box on the floor lower right is an air handler that includes a copper heat exchange coil. A continuously operating pump is clearly wasteful. This is only an example.

Creating the loop is fairly easy. Above the air handler is a smaller box containing the cooling coil. Tips when installing a tankless recirculation system. 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.

This is an example of how to set up a tankless water heater as a heat source and for your 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. Minimize the length of the run from the tankless water heater to the recirculation loop maximum 5 recommended. 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. Water boiler a boiler is used to heat just the water as it boils the water and turns it to steam.