Harwil
Harwil Flow Switch (3 Barb) | Hot Tub Replacement Part
Harwil Flow Switch (3 Barb) | Hot Tub Replacement Part
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The Harwil Flow Switch (3 Barb) is a genuine replacement part designed to detect water flow in hot tub plumbing systems, shutting down the heater if flow drops too low. It's commonly found in hot tubs from brands including Artesian, Dimension One, Sundance and LA Spas, typically paired with a Laing heater and Laing circulation pump.
- 3/4 inch barb straight-through connection with a 3/8 inch outlet on the bottom
- Length: 125mm; Height: 65mm
- Genuine Harwil manufactured flow switch
- Commonly compatible with Laing heater and circulation pump systems
- Protects your heater from running without adequate water flow
- Direct-fit replacement for a range of well-known hot tub brands
- Durable Harwil construction built for reliable, long-term operation
- Straightforward barb connection simplifies installation into existing plumbing
| Brand | Harwil |
| Product Type | Flow Switch |
| Connection | 3/4 inch barb straight-through, 3/8 inch bottom outlet |
| Length | 125 mm |
| Height | 65 mm |
| Compatible brands | Artesian, Dimension One, Sundance, LA Spas, and others using Laing heaters/pumps |
Before ordering, check other possible causes of a low-flow fault, as Harwil flow switches are generally durable and long-lasting. Once confirmed, fit the switch into your hot tub's plumbing using the 3/4 inch barb connection and 3/8 inch bottom outlet, replacing the existing unit. Installation should be carried out by someone familiar with hot tub plumbing and electrics.
Harwil is a well-established manufacturer of flow switches used across many major hot tub brands, known for durable components that reliably protect heating systems from low-flow conditions. This switch is a genuine, purpose-matched replacement rather than a generic aftermarket part.
- Check the switch periodically for scale or debris build-up that could affect operation
- Ensure connections remain watertight to prevent leaks around the barb fitting
- Have the switch and surrounding plumbing inspected if flow faults persist after replacement
- Keep the surrounding area free of debris that could restrict water flow
For delivery timelines and options, see our Shipping & Delivery page. If you need to return or exchange this item, details are available on our Returns & Refund Policy page.