---
product_id: 23454135
title: "23000105 0.5in Flow Switch for Q12DS"
brand: "coates heater"
price: "HK$998"
currency: HKD
in_stock: true
reviews_count: 2
category: "Coates Heater"
url: https://www.desertcart.hk/products/23454135-23000105-0-5in-flow-switch-for-q12ds
store_origin: HK
region: Hong Kong
---

# 120V operating voltage IP54 water-resistant rating Clamp mount for easy installation 23000105 0.5in Flow Switch for Q12DS

**Brand:** coates heater
**Price:** HK$998
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your flow flawless—because your spa deserves the best!

## Quick Answers

- **What is this?** 23000105 0.5in Flow Switch for Q12DS by coates heater
- **How much does it cost?** HK$998 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/23454135-23000105-0-5in-flow-switch-for-q12ds)

## Best For

- coates heater enthusiasts

## Why This Product

- Trusted coates heater brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Space-Savvy:** Slim 9x7x2 inch design fits seamlessly into your setup.
- • **Reliable Flow Detection:** Precision 10pdt contact ensures your Q12DS heater runs flawlessly.
- • **Trusted Brand Assurance:** Coates Heater & Harwil quality powering your pool or spa heater.
- • **Durable & Weather-Resistant:** IP54 rating means it thrives in damp, demanding environments.
- • **Effortless Swap-In Replacement:** Spade connectors simplify your upgrade—no epoxy hassle.

## Overview

The 23000105 0.5in Flow Switch by Coates Heater Company and Harwil is a robust, IP54-rated flow switch designed for Q12DS heating systems. Operating at 120 volts with a clamp mount and spade connectors, it offers easy installation and reliable flow detection to keep your spa or pool heater running smoothly.

## Description

Coates Heater Company, Harwil Flow Switch, 1/2"

Review: Check your connections - It’s an easy replacement. Many of the original sensors have the wires potted in epoxy. The replacement has spade connections on the unit make sure you have female spades to make the connection.
Review: Fast shipping - Perfect for my spa heater now it works again

## Features

- Coates Heater Company, Harwil Flow Switch, 1/2", 23000105.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00V4255Z8 |
| Actuator Type | Push Button |
| Best Sellers Rank | #216,816 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #261 in Swimming Pool Heater Parts |
| Brand | Coates Heater |
| Brand Name | Coates Heater |
| Circuit Type | 1-way |
| Color | Gray |
| Compatible Devices | Q12DS Heating System |
| Compatible with Vehicle Type | Vehicles (Cars, Trucks, etc.) |
| Connectivity Protocol | X-10 |
| Connector Type | Clamp |
| Contact Material | Copper |
| Contact Type | 10pdt |
| Control Method | Remote |
| Customer Reviews | 4.5 out of 5 stars 9 Reviews |
| International Protection Rating | IP54 |
| Item Dimensions | 9 x 7 x 2 inches |
| Manufacturer | Harwil Corporation |
| Material Type | Plastic |
| Model | 23000105 |
| Mounting Type | Clamp Mount |
| Number of Positions | 1 |
| Operating Voltage | 120 volts |
| Operation Mode | OFF-NONE-ON |
| Part Number | 23000105 |
| Specification Met | Ul, Culus, Ip54 |
| Switch Type | Flow Switch |
| Terminal | Physical |
| UPC | 710882488970 |
| Unit Count | 1 Count |
| Wattage | 144 watts |

## Product Details

- **Operation Mode:** OFF-NONE-ON
- **Operating Voltage:** 120 Volts
- **Contact Type:** 10pdt
- **Connector Type:** Clamp
- **Brand:** Coates Heater
- **Switch Type:** Flow Switch
- **Terminal:** Physical
- **Material:** Plastic
- **Item dimensions L x W x H:** 1 x 1 x 1 inches
- **Circuit Type:** 1-way

## Images

![23000105 0.5in Flow Switch for Q12DS - Image 1](https://m.media-amazon.com/images/I/51cBmBYqCZL.jpg)
![23000105 0.5in Flow Switch for Q12DS - Image 2](https://m.media-amazon.com/images/I/41t10t3XaXL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Check your connections
*by K***L on August 8, 2025*

It’s an easy replacement. Many of the original sensors have the wires potted in epoxy. The replacement has spade connections on the unit make sure you have female spades to make the connection.

### ⭐⭐⭐⭐⭐ Fast shipping
*by J***. on June 16, 2023*

Perfect for my spa heater now it works again

## Frequently Bought Together

- Coates Heater 23000105 0.5in Flow Switch for Q12DS
- Coates High Limit Switch 22003820

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**Shop now:** [https://www.desertcart.hk/products/23454135-23000105-0-5in-flow-switch-for-q12ds](https://www.desertcart.hk/products/23454135-23000105-0-5in-flow-switch-for-q12ds)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-08-01*