Things that every homeowner should know

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Indirect Fired Water Heaters

Indirect Fired Water Heaters(or boiler mate or hot water maker) get their heat from external source. It gets picked up from a hot water boiler, which is a completely separate unit. The boiler treats the hot water maker like an extra heat zone. This "heat zone" is coil of tubing inside the hot water maker. The rest of the unit is a storage tank for the domestic hot water, like a hot water heater.

These units are relatively trouble free, but they are directly tied to the heating system, so if that breaks, you also have no hot water. The other potential problem area is the circulator pump the moves the heat source water. If/when this pump goes bad, you would also have no hot water.

There are four pipe taps on a hot water maker. Two of them are the in and out for the heat source(coil inside), and the other two are for the domestic water tank inside. Hot water makers do not always come with a drain at the bottom, and a relief valve tap. They must be installed however. In the picture above, both the drain and the relief valve(just out of sight on the top) needed to be added by the installer.

The temperature is generally controlled by means of a low voltage aquastat mounted on the side of the unit. Everything else gets controlled by the boiler itself, as a heating zone.

Free Online Plumber does not warrant any of the information on this page, in regards to the accuracy or effectiveness of these procedures or this information. Always check and follow all applicable local plumbing codes.
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