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hydronic storage tank diagram

Using water or glycol as a heating fluid has great advantages. It is cost effective means to transfer energy from one source to another. The advantage of hydronic heating is also that its energy can be stored. In a simple radiant heat system we use concrete mass as a storage medium. However when we encounter houses with multiple heating requirements such as domestic hot water, in floor heat, fan coil radiators, pools and hot tubs, we need a method to harness the energy. This is done in a storage tank. The larger the storage tank, the larger the more energy we can store.

heat pump cyclesStoring energy is very useful especially in application such as cold climate heat pump, geothermal and solar thermal heating applications. For one it allows us reduce the short cycling of the compressor by adding more mass to heat. FACT – shorter heat pump cycles (on/off) cost more energy and lead to sorter life. By having a larger mass to heat the compressor turns on and runs longer as it has more to heat up. This reduces operating costs and extends the compressor life span. An energy storage tank acts like a large battery an is also useful to offset the supply and demand cycles of heating. In the winter the days are sunnier and warmer and nights are colder and dark. So if you are using an air source heat pump or solar thermal system the system will have a greater chance to capture heat energy during the day and at night when the home needs more demand it will draw this demand from the storage tank.

In many cases an inexpensive water tank will suffice as a storage means however they lack the sophistication that a proper storage tank can provide. Dedicated geothermal, solar thermal or Air source heat pump tanks will help to maximize the energy performance including features such as higher insulation, immersion probes for temperature sensors and optional internal heat exchangers.

Our SolarStor and GeoStor Water tanks are made in USA and have the required seal for ULS and CSA standards to be used both as free standing energy buffer tanks or potable domestic hot water tanks.

Back up Heating Element

Hydronic heating systems are considered the most reliable forms to heat a home or shop. However seldom do they come with back up heat source. All our energy storage tanks include a 4.5 Kw heating element that can be activate should a failure occur. In the case of a cold climate heat pump the element allows a home owner the security that if should the temperature fall outside the operating range they will still have heat energy.

Internal heat Exchangers

All our tanks are available with a bottom and top heat exchanger to integrate different heating methods. A bottom heat exchanger is used to easily adapt to a solar thermal system to assist with the heating of the tank and reduce the energy costs even further. A top heat exchanger can be used move heat energy form the storage tank to heat a zone such as a pool or a hot tub. In either case the heat exchangers provide flexibility to expand a system in the future.


  • Geo-Stor/Solar-Store water storage tanks feature an optional 4500W electric element for supplemental heating on the 60, 80 and 119 gallon geothermal water storage models.
  • All models feature factory installed brass drain valves, factory installed T&P valves and 2 magnesium anode rods.
  • All models have porcelain glass fused-to-steel interiors. Porcelain glass is impervious to chlorine and caustics making it the ideal lining for the water storage tank.
  • All models include 2" of non-CFC, zero-ozone depleting R15 foam insulation.
  • Dual-coil heat exchangers are available on the 80 and 119 gallon solar water heater models to provide additional heat transfer capacity when operated simultaneously; or, one coil can be dedicated for use with a boiler as an additional heating source in the potable domestic solar water heating application or as part of a radiant heating loop.
  • All tanks come with PT ports that are immersed directly inside the tank. These ports are used for PT1000 temp sensors to get the most accurate temperature reading of the buffer tank.

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Down Storage Load Product Specs

SolarStor with Heat Exchanger

SolarStor with Heat Exchanger

Solarstor Specifications



Complete home heating system with Buffer Tank

home heating system with buffer tank