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Caleffi Solar Expansion Tank
Expansion tanks for pressurized solar heating systems
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Modern solar heating systems can reach temperatures of up to 385°F during inactivity. The result is
the vaporization of the solar liquid and extreme temperatures in the solar circuit, up to the solar
station. This damages parts of the system, including pumps, connection joints and the diaphragm in the
expansion tank. Furthermore, in the event of prolonged heat absorption, for example in the summer, when on
vacation or if the electricity is out, the pressure of the solar systen can increase to the point of
activating the safety relief valve. In order to support the highest possible inactivity temperatures,
the special heat-resistant diaphragm in the SolarPlus expansion tank can withstand temperatures up to
210°F.
The diaphragm pressure expansion tank ensures that the system pressure does not exceed or drop below
the limits established in the system design. The diaphragm divides the space inside the tank occupied
by the pre-charged gas and the solar fluid. When the volume of the solar fluid expands because of the
heat, the diaphragm stretches into the gas chamber. As a result, the space available for the solar
fluid increases and the pressure inside the system remains constant at the designed value. When the
volume of the solar fluid decreases because of cooling, the diaphragm returns to the correct initial
pre-charged pressure.
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Features:
- Welded steel body
- Epoxy paint coating
- EPDM diaphragm
- Water, glycol solutions medium
- 50% maximum percentage of glycol
- System temperature range: 15...250°F
- Maximum diaphragm temperature: 210°F
- Maximum working pressure: 150 psi
- Pre-charged pressure: 35 psi
- Connection: 3/4" M
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Caleffi Tank Dimensions
Model 250012
- A = 3/4"
- B = 10 5/8"
- C = 10 5/8"
- D = 3/4"
- Size 3 gallons
Model 250018
- A = 3/4"
- B = 10 5/8"
- C = 13 3/4"
- D = 3/4"
- Size 5 gallons
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Expansion Tank Manual
Solar Heating FAQ's
Related Items:
Stiebel Eltron Solar Panels
Stiebel Eltron Indirect Tanks
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