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Spa Parts Made Simple

Pumps, heaters, control boards, and replacement parts — without the confusion.

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✔️ Real OEM & compatible spa parts
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✔️ Trusted by spa owners since 2015

Not sure which part fits your spa?

We make it easy to find the right replacement part — without guessing.

  1. Find your spa model
  2. Match the part number
  3. Order with confidence
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SpaShopper makes it easy to find quality hot tub and spa replacement parts without the frustration. From spa pumps and heaters to control boards, jets, filters, and plumbing components, we stock parts that fit a wide range of popular spa brands. Whether you’re fixing a heating issue, replacing a worn pump, or upgrading aging components, SpaShopper helps you get your spa running again quickly and confidently.

Correct-Tech (CTI)

Correct-Tech (CTI) flow thru heater assemblies are dependable, in-line heating units commonly found in older hot tubs and spas with CTI electronic packs (like Mini-Max series). These complete assemblies include stainless steel flow-thru manifolds, center-terminal heating elements, pressure switch taps (1/8" NPT), and unions/tailpieces for easy installation—providing safe, efficient heating with protection against dry firing.

This category features replacement CTI flow thru heater assemblies and direct-compatible options, typically in 4.0kW or 5.5kW ratings (240V standard), manifold lengths of 12.63" (often called 13"), 15", or 11" variants, 2" plumbing (with split nuts/gaskets), models like C2400-2300ET, C2550-2300ET, C2550-2315E, C2550-2311ET, and others. Many originals are discontinued, so we offer upgraded equivalents (e.g., from Therm Products or universal fits) with similar specs for reliable performance.

CTI assemblies vary by kW output, manifold length, element style (center mount), pressure tap location, union size, and pack compatibility (e.g., Mini-Max digital/non-digital)—precise matching is vital to prevent leaks, flow errors, or electrical issues.

Common problems include no heat from burnt-out elements, leaks at unions/gaskets from cracking or age, pressure switch failures causing no-flow shutdowns, scale/corrosion buildup restricting flow, hi-limit trips from poor circulation, or intermittent operation in legacy systems. Replacing the full flow thru heater assembly is the most effective fix for these older units, as individual parts are limited—often upgrading to modern equivalents avoids recurring failures.

To select the right CTI heater assembly:
- Confirm your spa brand/model with CTI controls, year, voltage, kW rating, manifold length/size, plumbing connections, and part numbers (e.g., C2400-2300ET, 20-00503).
- Note symptoms like no heat, pressure switch issues, or visible manifold markings.
- Avoid guessing—send us clear photos of your existing CTI heater (showing manifold, element label, pressure tap, unions, wiring, control pack, 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 Correct-Tech (CTI) flow thru heater assemblies today to restore reliable heating in your classic spa system with compatible, high-quality replacements.

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