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12" 5.5KW Incoloy Heater Assembly 26-1004-7S- 115/230V - Bubbles Supply
Exact Fit

12" 5.5KW Incoloy Heater Assembly 26-1004-7S-

Part #: 26-1004-7S-K

$474.34
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Also replaces

26-1004-7S
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

Professional-grade HydroQuip 12" 5.5KW Incoloy heater assembly designed for residential spas requiring reliable, high-output heating performance. This OEM replacement heater operates on dual voltage (115/230V) and delivers consistent 5.5KW power output through durable Incoloy heating elements that resist corrosion and mineral buildup. The 12-inch frame configuration fits standard spa equipment bays and provides efficient heat transfer for maintaining optimal water temperature.

At Bubbles Supply, we guarantee this heater assembly is an exact OEM fit for your HydroQuip system, backed by our comprehensive 1-year warranty and same-day shipping on in-stock orders. The Incoloy construction ensures long-lasting performance even in harsh spa chemical environments, making this heater ideal for fixing HH and OH error codes related to heating system failures. Professional installation recommended to ensure proper electrical connections and optimal performance.

Exact part number

26-1004-7S-K

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 12-inch heater assembly
  • 26-1004-7S
  • 5.5KW spa heater tube
  • HydroQuip heater element assembly
  • Incoloy heater manifold

Looking for an older part number? Check our supersession lookup tool

Fits these brands and models

Compatible brands

HydroQuipWatkinsCalderaHot Spring
Not sure if it fits your spa? Send us a photo — we'll confirm before you order

Technical specifications

Voltage
115V/230V dual

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • HH error code displayed on spa topside panel
  • OH error code (overheat) triggered by failed heater sensor or element
  • Spa water not heating or heating very slowly
  • Heater tripping GFCI or breaker repeatedly
  • Burnt or corroded heater element causing low heat output
  • Spa control board detecting open heater circuit

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing heater assembly is 12 inches in length — measure tube from end to end before ordering
  • Verify your spa pack's wattage rating accepts a 5.5KW element — check your control box label or documentation
  • Confirm voltage compatibility (115V or 230V) with your current spa pack configuration
  • Inspect existing heater unions and plumbing connections to ensure this assembly will mate correctly
  • Check whether your HH or OH error is heater-related or sensor-related — a faulty hi-limit sensor can trigger the same codes without requiring heater replacement
  • Record the full part number from your existing heater assembly label before ordering to confirm this is an exact match

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 45–90 minutes

What's in the box

  • 12" Incoloy heater assembly
  • Heater element with manifold tube
  • Pressure switch port (if equipped on assembly)

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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