🚀 New launch promo — 10% off orders over $300. Use code LAUNCH10
Bubbles Supply
Not sure which part you need? Upload a photo and we'll find it. →
4.0kW 230V Flow-Thru Heater C2400-0066ET-A 230V - Bubbles Supply

4.0kW 230V Flow-Thru Heater C2400-0066ET-A

Part #: C2400-0066ET-A

$116.51
In stock — ships today
Qty
🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
Add to B2B order list

Not sure this fits?

Send us a photo of your old part — we'll confirm the right replacement before you order.

Upload a Photo
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

This 4.0kW 230V flow-through heater assembly is an OEM replacement part designed for Gatsby spa systems requiring high-output heating performance. Manufactured by Therm Products, this heater delivers reliable 4,000-watt heating capacity at 230 volts through its compact 2" x 15" frame configuration, making it ideal for larger spa applications that demand consistent water temperature maintenance.

At Bubbles Supply, we guarantee this heater assembly provides an exact fit for your compatible spa system, backed by our comprehensive 1-year warranty and same-day shipping on in-stock orders. The flow-through design ensures efficient heat transfer while maintaining optimal water circulation through your spa's plumbing system. Always verify your existing heater's voltage requirements and physical dimensions before installation, and consider having a qualified technician handle the electrical connections to ensure safe, proper operation.

Exact part number

C2400-0066ET-A

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 4kW heater tube
  • flow-through heater element
  • Gatsby heater assembly
  • inline spa heater

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

Technical specifications

Voltage
230V
Frame size
2" x 15"
Port type
Flow-through inline

Plumbing notes

  • Port type: Flow-through inline

Need help measuring? Email hello@bubblessupply.com with a photo of your existing plumbing.

Common symptoms this part fixes

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

  • No heat or spa won't reach set temperature
  • Heater shuts off prematurely (OH fault / overheat code)
  • HH error code on spa controller
  • Burnt or corroded heater element
  • Water temperature drops significantly overnight
  • Spa display shows heater fault or open sensor code

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

Before you buy — quick checklist

  • Confirm your spa is a Gatsby system and currently runs a 230V heater — do not install on 120V systems
  • Verify your existing heater tube dimensions match 2" x 15" before ordering
  • Check the existing heater's wattage rating — this unit is 4.0kW and is not a direct swap for lower-output (e.g. 1.0kW or 2.0kW) heaters
  • Inspect your heater housing and manifold for corrosion or cracking — a failed element can sometimes damage surrounding plumbing
  • Confirm your spa controller and pressure/flow switch are functional before replacing the heater — these components can trigger the same fault codes

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

  • 4.0kW flow-through heater assembly
  • Mounting hardware (if applicable)

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.

🔒 Secure checkout · SSL encrypted·🇺🇸🇨🇦 Serving the US and Canada·↩️ 30-day hassle-free returns·📦 Same-day fulfillment