Spa Heater Elements

Replace a failed or scaled spa heating element with spa heater element replacements from PST Pool Supplies. We stock flow-through and flange heater elements in 1.5kW to 5.5kW ratings, 115V and 230V configurations, standard and titanium construction — starting from $37.30.

The spa heater element is the resistive heating component inside the heater tube that transfers electrical energy into heat as water flows past it. Elements fail in two ways: burnout (the resistive wire breaks, causing complete loss of heat) and calcium scale buildup (mineral deposits accumulate on the element surface, insulating it from the water and reducing heating efficiency — eventually causing overheating and element failure). The key products in this collection: Generic flow-through elements in 4.0kW and 5.5kW ratings (115V/230V dual-voltage) are the most universally compatible elements for residential spa heaters — the flow-through design (1/2\" x 1-1/4\" connection, 10\" immersion length) fits the vast majority of spa heater tube assemblies. The titanium-coated flow-through elements (4.0kW and 5.5kW) are the premium choice for salt water spas or spas with chronic calcium scaling — titanium is highly resistant to corrosion and mineral adhesion, extending service life significantly compared to standard Incoloy elements in aggressive water chemistry. The Watkins flange element (1.5kW, 115V, 11\" immersion, with gaskets) is the OEM replacement for Watkins-manufactured spas (Hot Spring, Limelight, and Tiger River brands) that use a flange-mounted rather than flow-through heater design.

Before replacing a heater element, confirm the element is actually the failed component: use a multimeter set to resistance (ohms) and measure across the two element terminals with power off. A functioning element reads resistance (typically 8–50 ohms depending on kW rating); an open circuit (infinite resistance/OL) confirms element burnout. Also check for visible scale buildup — an element that is electrically sound but heavily scaled can be descaled by soaking in dilute muriatic acid before reinstalling. When replacing, always drain the spa below the heater level, replace the heater gasket or O-rings (included with the Watkins flange element kit), and verify the kW rating and voltage match the original element before energizing.

Shop spa heater elements at PST Pool Supplies and restore full heating capacity to your hot tub with the correct element for your heater configuration.