Closed Loop Tankless Water Heater

A tankless water heater is an excellent option for homeowners looking to reduce energy consumption.

Closed loop tankless water heater.

However doing so in a way that doesn t waste a lot of energy is a little trickier. 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. The solar energy captured and stored in the solar panel cells is gradually transferred to the closed loop system which includes a heat. Tankless water heater as a heat source with domestic hot water.

They are a true boiler with all appropriate listings. This is called a closed loop heating system with domestic water. When the outlet is closed the system becomes a closed system but since the flow has ceased the tankless water heater stops heating the water. One of the reasons rinnai pulled their listing for closed loop heating is that it made no sense in getting asme for the whole line of water heaters.

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. Since it provides warm water almost immediately you don t have to wait or run the machine for long. Rinnai does have one water heater that has asme but we use it only for those commercial hot water jobs where codes require it.

A closed water heater system means that the hot water cannot expand beyond the valves and mix with the municipal water. Therefore methods for controlling pressure increases due to thermal expansion are not required. Whenever needed the storage tank draws heat from the heat exchanger and maintains a constant tank temperature. The valves that are usually found in the closed systems are the check valve pressure reducing valve mixing valve backflow preventer and other.

A continuously operating pump is clearly wasteful. This is only an example. Creating the loop is fairly easy. Closed loop solar water heater systems sometimes referred to as anti freeze or glycol systems include the heat collectors insulated piping a circulating pump an expansion tank a hot water storage tank a heat exchanger solar fluid usually a solution of water and nontoxic propylene glycol antifreeze a controller valves and gauges.