ACC Flow Thru Heater Assemblies for Hot Tubs & Spas

Applied Computer Controls (ACC)

Applied Computer Controls (ACC) flow thru heater assemblies are reliable, complete heating units designed for hot tubs and spas using ACC control systems. These assemblies feature stainless steel flow-thru manifolds with integrated heating elements, pressure/flow switches for safe operation, and fittings that ensure consistent water heating without dry firing risks.

This category includes replacement ACC flow thru heater assemblies and direct-compatible models, typically in 5.5kW, 6kW, 8kW, or 11kW ratings (120V/240V configurations), with 1-1/2" or 2" plumbing unions, tailpieces, split nuts, and often built-in hi-limit and temperature sensors or ports for ACC packs. Many ACC heaters use standard industry elements and switches, making cross-compatible options available for discontinued or hard-to-find originals.

ACC heater assemblies vary by kilowatt output, voltage, manifold length (commonly 10–15"), union/thread type, sensor integration (pressure switch or flow switch style), and specific ACC control pack compatibility—precise matching is essential to avoid fit issues, flow detection failures, or electrical mismatches.

Common problems include no heat from burnt-out elements, intermittent operation due to faulty pressure/flow switches, leaks at unions or gaskets from age/corrosion, overheating shutdowns (hi-limit trips), scale buildup restricting flow, or error codes related to poor circulation. Replacing the full ACC flow thru heater assembly is often the most effective solution for restoring reliable heating, especially when multiple components are worn.

To select the correct ACC heater assembly:
- Confirm your spa brand/model using ACC controls, year, voltage, current kW rating, plumbing size, and any visible part numbers on the manifold.
- Check for integrated sensors/switches and error codes displayed.
- Avoid guessing—send us clear photos of your existing ACC heater assembly (showing manifold, element label, unions, pressure/flow switch, wiring, and spa label with model/serial number) for expert verification.

Text photos to 772-800-5445 or call 844-500-4645—we'll confirm compatibility before you order. SpaShopper is not affiliated with any spa manufacturer. Brand names and part numbers are used for compatibility and identification purposes only.

Shop our Applied Computer Controls (ACC) flow thru heater assemblies today to get your spa heating quickly and dependably again.