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240V/5.5KW J-400 Heater 6500-843 - Bubbles Supply

240V/5.5KW J-400 Heater 6500-843

Part #: 6500-843

$619.70
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

This genuine Sundance Spas 240V/5.5KW heater assembly (part #6500-843) is designed specifically for J-400 series spa models. Built to OEM specifications, this plastic-housed heating element delivers reliable 5500-watt performance at 240 volts for consistent water temperature control in your North American spa installation.

At Bubbles Supply, we guarantee this heater provides an exact fit for your Sundance J-400 spa, backed by our comprehensive 1-year warranty. With same-day shipping available, you can get your spa heating properly again without delay. This heater addresses common heating issues including HH and OH error codes that indicate heater problems. Professional installation is recommended to ensure proper electrical connections and optimal performance in your spa's heating system.

Exact part number

6500-843

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 6500-843 heater
  • J-400 heating element
  • Sundance heater assembly

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

Technical specifications

Voltage
240V

Common symptoms this part fixes

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

  • Spa water not heating
  • HH error code displayed on topside control
  • OH error code (overheating/sensor fault) displayed on topside control
  • Spa heats intermittently or inconsistently
  • No heat output despite pump running normally

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

Before you buy — quick checklist

  • Confirm your spa is a J-400 series model — check the equipment bay label or owner's manual
  • Verify your spa runs on 240V service before ordering
  • Diagnose whether the HH or OH error is caused by the heater element itself vs. a temperature sensor or pressure switch before replacing
  • Inspect the existing heater housing for corrosion or scale buildup that may indicate a water chemistry issue requiring correction
  • Have a licensed electrician available — this is a 240V component requiring proper disconnect and reconnection

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

Install difficulty: Hard — Technician recommendedTypically 60-90 minutes

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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