24 pages

Thermal Expansion Tank Size by Heater Capacity and Supply Pressure

Quick answer

Thermal Expansion Tank Size by Heater Capacity and Supply Pressure: 24 pages. Higher supply pressure means less of an expansion tank is available to accept water, so the same heater needs a larger tank on a high pressure supply. These pages work through every combination.

30 gal at 40 psi A 30 gallon water heater at 40 psi static pressure needs about 0.75 gallons of expansion tank, which is a standard 2 gallon tank p
30 gal at 50 psi A 30 gallon water heater at 50 psi static pressure needs about 0.82 gallons of expansion tank, which is a standard 2 gallon tank p
30 gal at 60 psi A 30 gallon water heater at 60 psi static pressure needs about 0.92 gallons of expansion tank, which is a standard 2 gallon tank p
30 gal at 70 psi A 30 gallon water heater at 70 psi static pressure needs about 1.03 gallons of expansion tank, which is a standard 2 gallon tank p
40 gal at 40 psi A 40 gallon water heater at 40 psi static pressure needs about 1 gallons of expansion tank, which is a standard 2 gallon tank pre-
40 gal at 50 psi A 40 gallon water heater at 50 psi static pressure needs about 1.1 gallons of expansion tank, which is a standard 2 gallon tank pr
40 gal at 60 psi A 40 gallon water heater at 60 psi static pressure needs about 1.23 gallons of expansion tank, which is a standard 2 gallon tank p
40 gal at 70 psi A 40 gallon water heater at 70 psi static pressure needs about 1.38 gallons of expansion tank, which is a standard 2 gallon tank p
50 gal at 40 psi A 50 gallon water heater at 40 psi static pressure needs about 1.26 gallons of expansion tank, which is a standard 2 gallon tank p
50 gal at 50 psi A 50 gallon water heater at 50 psi static pressure needs about 1.38 gallons of expansion tank, which is a standard 2 gallon tank p
50 gal at 60 psi A 50 gallon water heater at 60 psi static pressure needs about 1.54 gallons of expansion tank, which is a standard 2 gallon tank p
50 gal at 70 psi A 50 gallon water heater at 70 psi static pressure needs about 1.73 gallons of expansion tank, which is a standard 2 gallon tank p
66 gal at 40 psi A 66 gallon water heater at 40 psi static pressure needs about 1.66 gallons of expansion tank, which is a standard 2 gallon tank p
66 gal at 50 psi A 66 gallon water heater at 50 psi static pressure needs about 1.83 gallons of expansion tank, which is a standard 2 gallon tank p
66 gal at 60 psi A 66 gallon water heater at 60 psi static pressure needs about 2.03 gallons of expansion tank, which is a standard 2.1 gallon tank
66 gal at 70 psi A 66 gallon water heater at 70 psi static pressure needs about 2.29 gallons of expansion tank, which is a standard 4.4 gallon tank
75 gal at 40 psi A 75 gallon water heater at 40 psi static pressure needs about 1.89 gallons of expansion tank, which is a standard 2 gallon tank p
75 gal at 50 psi A 75 gallon water heater at 50 psi static pressure needs about 2.08 gallons of expansion tank, which is a standard 2.1 gallon tank
75 gal at 60 psi A 75 gallon water heater at 60 psi static pressure needs about 2.31 gallons of expansion tank, which is a standard 4.4 gallon tank
75 gal at 70 psi A 75 gallon water heater at 70 psi static pressure needs about 2.59 gallons of expansion tank, which is a standard 4.4 gallon tank
80 gal at 40 psi A 80 gallon water heater at 40 psi static pressure needs about 2.01 gallons of expansion tank, which is a standard 2.1 gallon tank
80 gal at 50 psi A 80 gallon water heater at 50 psi static pressure needs about 2.21 gallons of expansion tank, which is a standard 4.4 gallon tank
80 gal at 60 psi A 80 gallon water heater at 60 psi static pressure needs about 2.45 gallons of expansion tank, which is a standard 4.4 gallon tank
80 gal at 70 psi A 80 gallon water heater at 70 psi static pressure needs about 2.76 gallons of expansion tank, which is a standard 4.4 gallon tank