115V 43 Series Circulation Pump 31842

Name: 115V 43 Series Circulation Pump 31842
Brand: Grundfos
SKU: 31842
Price: 401.96 USD
Availability: InStock

Part #: 31842

$401.96

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About this circulation pump

This Grundfos 43 Series circulation pump delivers reliable water circulation for residential spas requiring 115V power. With 0.06 horsepower and 1-inch barb connections, this thermoplastic pump maintains consistent water flow and temperature distribution throughout your spa system.

Built to OEM specifications, this Grundfos circulation pump provides the exact fit your spa needs with our guaranteed compatibility promise. Every pump ships the same day you order and includes our comprehensive 1-year warranty for complete peace of mind. The compact 43 Series design fits standard spa equipment compartments while delivering whisper-quiet operation. Before installation, verify your spa's voltage requirements and plumbing connections match the 115V specification and 1-inch barb fittings to ensure proper performance.

Exact part number

31842

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Also known as / Replaces

This part replaces or is interchangeable with:

Grundfos 43 Series circ pump
spa circulation pump 31842
UP 43 series

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

Technical specifications

Voltage: 115V
Horsepower: 0.06 HP
Speed: Single-speed

Common symptoms this part fixes

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

DR, FL1, FLO, or ICE error codes on spa display
No water circulation despite pump running
Spa not reaching or holding set temperature
Spa water not filtering properly between cycles
Pump seized or not starting after period of inactivity

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

Before you buy — quick checklist

Confirm your spa runs on 115V — do not install on a 240V system
Verify your existing circ pump uses 1-inch barb connections before ordering
Record the full model number from your current pump label — confirm it is a Grundfos 43 Series
Check that your equipment compartment accommodates the compact 43 Series footprint
Inspect existing plumbing for damage or buildup that should be addressed before swapping the pump

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

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.

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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.