Heat Storage Tank

For wood burning boilers (Solo Plus and Excel models), the best installations include a heat storage tank. By storing boiler heat in an insulated water storage tank, you gain increased operating flexibility, and you can easily extend the wood-heating season.

When these boilers are operating, they produce heat at full output with the cleanest and most efficient operation, however, the output is usually greater than the heating requirements of the house or building. This "extra" heat is then transferred to the storage tank for use later. With this storage buffer, you are free to fire the boiler when it is convenient for you.

On most days in the winter you will be able to load the boiler once in 24 hours. In summer, you will be able to go 7-10 days between firings to heat all of your domestic hot water. You don't need to rush home or get up early to load more wood.

There are no problems with creosote or overheating if the boiler is oversized. The insulated storage tank absorbs the heat produced until the wood is consumed and the boiler shuts off. Heat is recaptured from the storage tank as heat and domestic hot water is needed.

Adding Heat Storage To Your System

How do you add heat to your system?

The first requirement is to get a tank. We recommend a 600-gallon tank with the Solo Plus 30, MB 40, and EXCEL 2000. Tanks of 800 gallons or more are recommended for the Solo Plus 40, Solo Plus 60, MB 55, MB 75 and the EXCEL 2000.

We sell heat storage in sizes, ranging from 400 to 1500 gallons. This enables us to create a perfect wood heating system for your needs.

Top photo: Heat storage tank with HS-TARM boiler at back left.

Bottom photo: Top view of heat storage tank
(with insulated top removed), showing two heat exchange coils connected in parallel. Typically, a third coil is also installed for heating domestic hot water.