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Cal Spas XL 5.5 kW 15 inch flo-thru heater assembly (HydroQuip 26-0011-F-RS-K titanium / 26-0011-7S-K Incoloy, C2550-0011)
Discontinued Balboa / Cal Spas XL heat exchanger heater that this XL 5.5 kW flo-thru heater replaces

Cal Spas XL 5.5 kW Flo-Thru Heater, 15 Inch, Titanium – Direct Replacement

$219.99

Fits:
Cal Spas hot tubs with the XL 5.5 kW heater, including the older XL heat-exchanger style (titanium or Incoloy)

Common Symptoms:
• Spa won’t heat, or heats very slowly
• GFCI trips when the heater turns on
• Water leaking at the heater
• Heater flow or overheat messages that come back after a reset

Compatibility:
Direct replacement for the Balboa / Cal Spas XL 5.5 kW heater: 230V, 2″ x 15″ stainless flo-thru with 2″ slip tailpieces and gaskets. The titanium element also replaces Incoloy XL heaters. Pressure switch and sensors are not included.

Not sure?
Send us a photo of your heater label and we’ll confirm compatibility.

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Cal Spas XL 5.5 kW Flo-Thru Heater, 15 Inch, Titanium – Direct Replacement

This is the replacement Cal Spas XL Series flo-thru heater: 5.5 kW at 230V, 15″ long, with a titanium heating element. It is the titanium version of the XL heater. The same heater is also made with an Incoloy element, and your old heater’s part number tells you which one you have.

Heaters are matched by part number, not by photo. Cal Spas has used several heaters that look similar but belong to different control systems. Check the label on your old heater first.

Specifications

  • Heater type: flo-thru (water passes through the heater tube)
  • Heater output: 5.5 kW
  • Voltage: 230V
  • Housing: 2″ x 15″ stainless steel flo-thru
  • Connections: 2″ slip tailpieces with gaskets
  • Pressure switch port: 1/8″ tap
  • High limit: auto-reset
  • Element: titanium
  • Series: Cal Spas XL
  • Manufacturer: HydroQuip

Titanium or Incoloy?

The two XL heaters are the same 5.5 kW, 15″, 230V assembly with different element metals. Order the one that matches your old part number. If your label shows a titanium (TI) number, this is your heater. If it shows a plain XL heater number, order the Incoloy XL heater. Titanium elements are generally chosen for their resistance to corrosion, and this titanium heater also replaces an Incoloy XL heater, so it works as an upgrade.

Compatibility & Installation

  • For Cal Spas spas that use the XL Series 5.5 kW flo-thru heater
  • Match the part number on your old heater’s label (the full list is in the FAQ below)
  • Check the voltage: this heater is 230V
  • The pressure switch and sensors are not included. Move them over from your old heater, or replace a worn switch at the same time with the Cal Spas heater pressure switch and pressure switch harness
  • Drain the spa, or isolate the heater, before you open the plumbing. The 2″ slip tailpieces and gaskets come with the heater

Before you start: turn off power at the breaker. Heater replacement involves 230V wiring. If you’re not comfortable working inside the equipment bay, hire a qualified spa technician.

After you install: refill the spa and bleed any trapped air from the pump and heater before you turn the heat on. A heater with an air pocket can overheat or dry-fire.

What’s in the Box

One Cal Spas XL 5.5 kW titanium flo-thru heater assembly with 2″ slip tailpieces and gaskets, as pictured. The pressure switch and sensors are not included. Reuse yours, or order the pressure switch and harness separately.

Common Symptoms of a Failing Heater

  • No heat, or very slow heating, when the water is flowing well
  • The GFCI trips as soon as the heater comes on (often a shorted element)
  • Water leaking from the heater tube or at a union
  • Scale or burn marks on the element terminals

Check the filter first. A dirty filter cuts the flow through the heater, and that causes most “no heat” calls. Pull the filter, run the spa and see if it heats. A bad pressure switch or sensor can also stop the heater even when the element is fine.

Replacement Information

Replaces the older-style Balboa / Cal Spas XL heat exchanger heater. On the original, the heating element was wrapped around the outside of the heater housing. This replacement is an in-line flo-thru heater with a replaceable element inside the tube, so a future element failure doesn’t mean buying the whole heater again (replacement 5.5 kW element). It covers both the titanium and the Incoloy XL heater numbers listed in the FAQ below.

Related Parts

All Cal Spas Heaters | Cal Spas Circuit Boards | Cal Spas Filters | Cal Spas Resource Center

Shipping

Ships directly from our heater distributor, usually within 1–2 business days. Orders over $99 ship free in the lower 48.

*Manufacturer reserves the right to make production changes. Actual product received may vary slightly in appearance but the function remains the same.

✅ Not Sure It Fits? Verify Before Ordering

Hot tub part compatibility can vary by spa brand, model, year, serial number, control system, and part revision.

To help us identify the correct replacement part, please send clear photos of:

  • Your existing part label or sticker
  • Your spa serial number sticker
  • The equipment area or installation location (if accessible)

EZ Hot Tub Parts can help confirm fitment before you order and help reduce costly returns.


Cal Spas XL Titanium Heater FAQs

It fits Cal Spas that use the XL Series 5.5 kW, 230V, 15″ flo-thru heater with a titanium element. Match the number on your old heater. This assembly (HydroQuip 26-0011-F-RS-K) replaces Cal Spas C2550-0011TI, HEA14100300 and HEA14100470. If you can’t read your label, send photos through the fit-check form above.

Only the element metal. Both are 5.5 kW, 230V and 15″ long. Titanium numbers (like C2550-0011TI) take this heater. Plain numbers (like C2550-0011, HEA14100120 or XL5.5) take the Incoloy version, HydroQuip 26-0011-7S-K. This titanium heater also replaces those Incoloy numbers, so it works as an upgrade.

The usual signs are no heat with good water flow, a GFCI that trips when the heater turns on, or a leak at the heater. Check the filter, the pressure switch and the temperature sensors first, because any of them can stop the heater even when the element is fine.

No. The heater comes with 2″ slip tailpieces and gaskets, but not the pressure switch or sensors. Most owners move those over from the old heater. If your pressure switch is old or corroded, replace it now: the heater has a 1/8″ pressure switch tap for the 25 amp switch (HydroQuip 34-0019-D-K, replaces 3010P / 4010P) and the Balboa 21223 harness.

Many owners do. Turn off power at the breaker, drain the spa or close the valves, and use new union gaskets. The heater is wired at 230V, so hire a qualified spa technician if you’re not comfortable with electrical work.

It’s usually air trapped in the plumbing, or low flow from a dirty filter. Turn the power off, bleed the air from the pump and heater, check the filter, then power back up. If the message keeps coming back, a sensor or the pressure switch may be the problem.

It ships directly from our heater distributor, usually within 1–2 business days. Orders over $99 ship free in the lower 48.

26-0011-F-RS-K 260011FRSK 26-0011-F-RS C2550-0011TI C25500011TI HEA14100300 HEA14100470 cal spa xl heater titanium cal spas 5.5kw heater cal spa heater 15 inch flo thru 25-150-0011 CALHEA14100401 C2550-0011-100 F2550-1100-100 HEA14100310 46-555-2000 F2550-0011-101 F2550-0011-100 9145-010 HTR465552000 F2550-0001-ET 2-00-0031 26-0071FXL C2550-0011 F2550-0011 F2550-0001 B24055XL XL5.5 HEA14100120 HEA14100121 HEA14100401 cal spa xl heat exchanger replacement

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