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4.0KW 230V Low Flow Heater C3473-1 230V - Bubbles Supply
Exact Fit

4.0KW 230V Low Flow Heater C3473-1

Part #: C3473-1

$213.80
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Also replaces

C3473-1
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

The Balboa 4.0KW 230V Low Flow Heater C3473-1 is a genuine OEM replacement heating assembly designed for Watkins and Caldera spa systems. This low-flow U-bend heater operates at 4.0 kilowatts on 230-volt power, delivering reliable heating performance for your spa's circulation system. The compact design fits seamlessly into existing heater housings while providing the consistent heat output your spa requires.

At Bubbles Supply, we guarantee this Balboa heater is an exact fit for your system, backed by our comprehensive 1-year warranty and same-day shipping on in-stock items. This OEM part effectively resolves common heating issues including HH (high heat) and OH (overheat) error codes that can interrupt your spa enjoyment. Always verify your existing heater's specifications and voltage requirements before installation, and consider professional installation for optimal safety and performance.

Exact part number

C3473-1

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Also known as / Replaces

This part replaces or is interchangeable with:

  • Balboa low flow heater
  • C3473-1
  • Caldera spa heater element
  • U-bend heater
  • Watkins replacement heater

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

Fits these brands and models

Compatible brands

WatkinsCaldera
Not sure if it fits your spa? Send us a photo — we'll confirm before you order

Technical specifications

Voltage
230V

Common symptoms this part fixes

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

  • Spa not heating or heating slowly
  • HH (high heat) error code on control panel
  • OH (overheat) error code on control panel
  • Spa water temperature dropping and not recovering
  • Heater element failure causing system shutdown

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

Before you buy — quick checklist

  • Confirm your spa runs on 230V — do not install on a 115V system
  • Verify your existing heater is rated 4.0KW before ordering
  • Confirm your spa brand is Watkins or Caldera — this is not a universal fit
  • Match the C3473-1 SKU on your current heater assembly label before purchasing
  • Check that your circulation pump is functional — a low-flow heater depends on adequate water movement to operate safely

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

  • Balboa 4.0KW heater assembly
  • Replacement O-rings (if included with OEM unit)

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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