Thermal Energy Storage
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.
For wood burning boilers, 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.
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.
