Water Heater Expansion Tanks, Secondary Pressure Relief, and why they're needed.
What's the funny looking tank on top of my heater? Commonly called an expansion tank or a pressure tank, its only purpose is to regulate expanding pressures created from various places. Thermal expansion is required for all newer construction and is generally included in all retrofitted water heater replacements when needed. Having thermal expansion is required by code, and is also typically recommended or required by heater manufacturers. Thermal expansion control is a mode