---
product_id: 418519981
title: "Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray"
brand: "watts"
price: "$506"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/418519981-watts-etx-30-non-potable-water-expansion-tank-1-2
store_origin: NZ
region: New Zealand
---

# 1/2 in MNPT connection 4.5 gal capacity Pre-charged 12 psi, max 60 psi pressure Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray

**Brand:** watts
**Price:** $506
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay cool under pressure with Watts ETX-30 – the silent guardian of your heating system! 🛠️

## Quick Answers

- **What is this?** Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray by watts
- **How much does it cost?** $506 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/418519981-watts-etx-30-non-potable-water-expansion-tank-1-2)

## Best For

- watts enthusiasts

## Why This Product

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

## Key Features

- • **Compact Yet Powerful:** 4.5-gallon volume fits seamlessly into tight spaces while handling thermal expansion like a pro.
- • **Versatile Compatibility:** Ideal for residential and commercial closed loop systems, supporting a wide range of heating outputs.
- • **Smart Pre-Charged Design:** Comes pre-pressurized at 12 psi for instant, hassle-free installation and optimal performance.
- • **Durable Carbon Steel Build:** Epoxy-coated steel tank ensures long-lasting corrosion resistance and rugged reliability.
- • **Effortless Pressure Control:** Keeps your hydronic heating system pressure perfectly balanced to avoid costly relief valve trips.

## Overview

The Watts ETX-30 is a 4.5-gallon, carbon steel non-potable water expansion tank designed for closed loop hydronic heating systems. Pre-charged at 12 psi and rated for up to 60 psi, it controls thermal expansion to maintain system pressure below relief valve settings. Featuring a durable expansion membrane and 1/2 inch MNPT connection, it ensures long-lasting, trouble-free operation in both residential and commercial applications.

## Description

Non-potable water expansion tanks are for use in commercial and residential closed loop hydronic heating system piping to control the thermal expansion of hot water and maintain system pressure below the relief setting of the relief valve. The pre-pressurized steel tank features durable expansion membrane that prevents contact of the water with the air in the tank. This rugged diaphragm minimizes loss of the air change and ensures long and trouble-free life for the system. Model ETX mounts to supply piping. Maximum Pressure 75psi 5.3 bar for ETX. 4.7 gallon For closed loop hydronic piping system 1/2 inches male pipe thread Used on closed loop hydronic system piping to control thermal expansion of hot water Accepts increased volume of eater created when the system water is heated Steel construction Rugged flexible diaphragm Compact size Compatible with gylcol systems Hydrostatic test pressure 75 PSI Maximum temperature 240 fahrenheit Maximum pressure 60 PSI Pre-charged at 12 PSI For use on finned tube baseboard from 25,000 BTU to 150,000 BTU, Convectors unit heaters from 75,000 BTU to up to 100,000 BTU, Cast iron radiators from 50,000 BTU to 100,000 BTU cast iron baseboards up to 50,000 BTU net boiler output.

## Features

- This non-portable water expansion tank is for closed loop hydronic heating system piping to control the thermal expansion of hot water and maintain system pressure below the relief sett of the relief valve
- The carbon steel tank is pre-charged at 12 psi, has a 4.5 gallon volume, and features a durable expansion membrane preventing minimizes loss of the air change and ensures long and trouble-free life for the system
- Made of carbon steel with epoxy finish, mounts to supply piping, with 1/2 inch MNPT system connection and .302-32 inch charging valve connection for on-site charging of the tank
- Maximum pressure 60 psi and can be used in residential or commercial hydronic heating systems
- Use in tandem with your hot water heater to absorb increased water volume ensuring long and trouble-free life for the system

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item diameter | 0.75 Inches |
| Item Weight | 8 Pounds |
| Is assembly required | No |
| Batteries required | No |
| Included components | Expansion Tank |

## Product Details

- **Brand:** Watts
- **Product Dimensions:** 10.5"W x 14.8"H
- **Color:** Gray
- **Wattage:** 30 watts
- **Style:** Non-Potable

## Images

![Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray - Image 1](https://m.media-amazon.com/images/I/51mEF4g1JWL.jpg)
![Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray - Image 2](https://m.media-amazon.com/images/I/61xUjlFMhPL.jpg)
![Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray - Image 3](https://m.media-amazon.com/images/I/61Chl3Np7GL.jpg)
![Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray - Image 4](https://m.media-amazon.com/images/I/61YFIVGPMNL.jpg)
![Watts ETX-30 Non-Potable Water Expansion Tank 1/2 in MNPT Connection, 4.5 gallon, Gray - Image 5](https://m.media-amazon.com/images/I/61I+1a2dY-L.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Frequently Bought Together

- Watts ETX-30 Non-Potable Water Carbon Steel Expansion Tank for Closed Loop Hydronic Heating System Piping, 1/2" MNPT Connection, Tank Volume 4.7 Gallons, Maximum Pressure 75 psi
- Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent
- Watts 0342691 30 PSI Pressure Relief Valve, Bronze, 3/4" 335 M2-030

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-01-24*