Flow-Thru Heaters

Flow-thru heaters are the standard heating solution found in most modern hot tubs and spas. Water flows directly through the heater tube across the heating element, providing efficient and consistent warmth. Our selection of flow-thru heaters covers a wide range of wattages and connection sizes to match your existing spa plumbing. Replacing a faulty flow-thru heater is one of the most impactful repairs you can make. Shop our collection and get free shipping on orders over $75.