2 Gallon Water Heater Expansion Tank

This 2-gallon (8-liter) expansion tank is designed for use with both electric and gas water heaters in closed-loop systems where thermal expansion of hot water must be accommodated. Constructed of durable steel with a compact footprint (15″ height × 11.5″ width), it offers a robust solution to protect your plumbing and water heater from the pressure surges that result when water heats and expands. Rated for maximum operating temperatures of up to 200 °F, the tank effectively captures excess volume created as water is heated, preventing back-flow into the cold-water supply, avoiding unwanted discharge through relief valves, and reducing stress on piping, the water heater, and fittings. Easy to install on the cold-water inlet (or appropriate expansion tee) upstream of the water heater, it delivers a cost-effective safeguard that promotes system longevity, better performance and peace of mind.

Key Features

• 2-gallon/(8 L) capacity — sized for typical residential water-heater expansion loads

• Steel construction — rugged and built for durability in demanding environments

• Compact size — 15″ (height) × 11.5″ (width) for convenient mounting near the water heater

• Maximum temperature rating: 200 °F — suitable for most domestic electric or gas water-heater systems

• Suitable for both electric and gas water heaters — versatile application

• Helps prevent relief-valve discharge and excessive pressure buildup in closed-loop systems

• Protects piping, water heater tank, and fixtures from thermal expansion stresses

• Simple installation — connects on the cold‐water inlet or expansion tee ahead of the water heater