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4.0KW Flo-Thru Heater Element 25-C3108 230V - Bubbles Supply

4.0KW Flo-Thru Heater Element 25-C3108

Part #: 25-C3108

$27.85
In stock — ships today
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Also replaces

25-C3108
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater element

This 4.0kW flo-thru heater element from Therm Products delivers reliable heating performance for 230V spa systems. The bent bowtie design with protective coating ensures efficient heat transfer while extending element life in demanding hot tub environments. At 4000 watts, this element provides the power needed to maintain your spa's optimal temperature.

We guarantee an exact fit for your heating system and back every element with our comprehensive 1-year warranty. Your replacement ships the same day you order, getting your spa back to perfect operating condition fast. Professional installation is recommended—always verify voltage requirements and ensure power is completely disconnected before replacing any heating element.

Exact part number

25-C3108

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 25-C3108
  • 4kW spa heater element
  • bowtie heater element
  • flo-thru heater element
  • flow-through heater element

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

Technical specifications

Voltage
230V
Amperage
17.4A @ 230V

Common symptoms this part fixes

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

  • Spa water not heating
  • Spa takes too long to reach set temperature
  • OH (overheat) fault code on spa controller
  • HH fault code on spa controller
  • Element failed continuity test with multimeter
  • Visible corrosion or burn damage on existing element

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

Before you buy — quick checklist

  • Confirm your spa runs on 230V — this element is not compatible with 115V systems
  • Test your existing element with a multimeter to confirm it has failed before ordering
  • Verify your heater housing accepts a flo-thru style element and matches the bowtie form factor
  • Check the watt rating on your current element — confirm 4.0kW is the correct rating for your heater assembly
  • Inspect the heater housing, unions, and o-rings for damage while the system is open — replace as needed

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

Install difficulty: Medium — Some experience neededTypically 45–90 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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