Pentair ETi 400 High Efficiency Gas Heater

The ETi 400 is Pentair's largest single-stage gas heater in this lineup, rated at 400,000 BTU with a 96% thermal efficiency figure from its Titan-Tough Direct-Fire titanium heat exchanger. At 379 lb and running on either 120V or 240V single-phase power behind a 15A breaker, it's built for commercial-adjacent or large residential installs where heat-up time matters. Ships standard on natural gas, with a propane conversion kit (476072) available separately.

• 400,000 BTU output at 96% thermal efficiency
• Titan-Tough Direct-Fire titanium heat exchanger
• Natural gas standard; propane conversion via kit 476072
• 120V/240V, 60Hz, single-phase, 15A breaker
• ASME BPVC and CSA listed, CSA Design Certified
• 3-year parts and labor warranty