{"product_id":"pentair-max-e-therm®-400-hd-natural-gas-pool-spa-heater-400k-btu","title":"Pentair Max-E-Therm® 400 HD Natural Gas Pool \u0026 Spa Heater 400K BTU","description":"\u003cp data-path-to-node=\"1\"\u003eThe Pentair Max-E-Therm® 400HD is a heavy-duty, 400,000 BTU natural gas heater engineered for rapid heating and extreme resilience in high-demand pool and spa environments. This \"HD\" model is specifically upgraded with a high-performance cupro-nickel heat exchanger, providing a robust defense against the corrosive effects of salt-chlorination systems and fluctuating water chemistry. It utilizes an advanced pre-mixed combustion system that optimizes the air-to-gas ratio, ensuring industry-leading heat-up times and high energy efficiency while maintaining an eco-friendly \"Low NOx\" certification. The unit is housed in a sleek, matte-black enclosure made of Dura-Glas™—a high-density, rust-proof composite resin designed to survive the harshest outdoor elements and chemical exposure without corroding or fading. Featuring an intuitive digital control panel with self-diagnostic alerts and precise temperature management, the Max-E-Therm 400HD offers a sophisticated user experience alongside its industrial power. Despite its compact, space-saving footprint, the reinforced internal firebox and substantial cupro-nickel components provide a solid, professional-grade construction. The Pentair Max-E-Therm 400HD Natural Gas Heater weighs approximately \u003cb data-path-to-node=\"1\" data-index-in-node=\"1256\"\u003e138 pounds\u003c\/b\u003e, serving as a durable, long-lasting, and powerful heating solution for large residential and commercial aquatic systems.\u003c\/p\u003e","brand":"Commercial Pool and Spa Supplies","offers":[{"title":"Default Title","offer_id":53093370757231,"sku":"SR400HD","price":8036.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/3785\/3807\/files\/max_e_therm_f4db2ece-2500-4d98-bbc4-2b3d8ecfb82b.avif?v=1778770354","url":"https:\/\/commercialpoolandspasupplies.com\/products\/pentair-max-e-therm%c2%ae-400-hd-natural-gas-pool-spa-heater-400k-btu","provider":"Commercial Pool and Spa Supplies ","version":"1.0","type":"link"}