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NEO 2100 System 777-WW00100 - Bubbles Supply

NEO 2100 System 777-WW00100

Part #: 777-WW00100

$1708.94
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this hardware/other

The NEO 2100 System 777-WW00100 is a complete Waterway spa heater system featuring a powerful 5.5kW heating element. This OEM replacement heater is designed to fit various spa models that originally came equipped with Waterway NEO 2100 heating systems, delivering reliable hot water heating for your spa experience.

Built to Waterway's exacting standards, this heater system provides the exact performance your spa requires to maintain optimal water temperature. At Bubbles Supply, we guarantee an exact fit for your spa and offer same-day shipping to get your spa running quickly. Each heater comes backed by our comprehensive 1-year warranty for complete peace of mind. Before installation, verify your existing heater's model number and electrical requirements match this 5.5kW specification to ensure proper compatibility and safe operation.

Exact part number

777-WW00100

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 777-WW00100 heater
  • NEO 2100 heater assembly
  • Waterway NEO heater system

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 not heating or maintaining temperature
  • High limit (HH) fault code on spa controller
  • Overheat (OH) fault code on spa controller
  • Heater element burned out or failed continuity test
  • Spa water stays cold despite pump running normally
  • Visible corrosion, scale buildup, or physical damage on existing heater assembly

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

Before you buy — quick checklist

  • Confirm your spa originally shipped with a Waterway NEO 2100 heater system — check the heater label or spa documentation
  • Verify your spa's electrical supply is 240V and matches the 5.5kW rating of this unit
  • Locate the model number on your existing heater and confirm it matches 777-WW00100 before ordering
  • Inspect existing plumbing union sizes and connection orientation to ensure this assembly will fit your current plumbing layout
  • Check whether your HH or OH fault codes are being triggered by a faulty sensor versus the heater element itself — replacing the heater won't resolve a sensor-only fault

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

Install difficulty: Medium — Some experience neededTypically 60–90 minutes

What's in the box

  • NEO 2100 heater assembly (complete system)
  • Heater unions or union fittings
  • Replacement O-rings

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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