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IN.YJ Heat.Wav 4.0KW 115/230V Flow Thru Heater 0613-421009 120/240V - Bubbles Supply

IN.YJ Heat.Wav 4.0KW 115/230V Flow Thru Heater 0613-421009

Part #: 0613-421009

$505.22
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

The IN.YJ Heat.Wav 4.0KW heater assembly delivers reliable heating performance for compatible Gecko Alliance spa systems. This flow-through heater operates at dual voltage (115/230V) with 4.0kW heating capacity, making it suitable for mid-size to larger hot tubs requiring efficient water heating. The Heat.Wav technology provides consistent temperature control while the flow-through design ensures optimal heat transfer.

Built to Gecko Alliance OEM specifications, this heater assembly guarantees an exact fit for your spa's heating system. At Bubbles Supply, we back this genuine Gecko heater with our standard 1-year warranty and offer same-day shipping to get your spa running quickly. The dual voltage capability allows for flexible installation options depending on your electrical setup. Verify your existing heater's part number and voltage requirements before ordering to ensure proper compatibility with your spa's control system.

Exact part number

0613-421009

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Also known as / Replaces

This part replaces or is interchangeable with:

  • Gecko 4000W Flow Through Heater
  • Heat.Wav 4kW Heater

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

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:

  • No heat - water stays cold
  • Heater trips breaker repeatedly
  • HH error code on control panel
  • OH error code on control panel
  • Inconsistent water temperature
  • Heater element burned out

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

Before you buy — quick checklist

  • Match exact part number 0613-421009 on your old heater
  • Verify your electrical setup matches 115V or 230V requirement
  • Confirm 4.0kW power rating matches your system
  • Check that your control system is Gecko Alliance compatible
  • Measure heater union connections for proper fit
  • Ensure adequate electrical capacity for 4kW load

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

  • Heat.Wav heater assembly
  • Installation instructions
  • Heater unions
  • O-ring seals

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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