---
product_id: 294930000
title: "Watts ETX-30 4.7-Gallon Non-Potable Expansion Tank for Closed-Loop Systems"
brand: "watts"
price: "KD 85.50"
currency: KWD
in_stock: true
reviews_count: 5
category: "Watts"
url: https://www.desertcart.com.kw/products/294930000-watts-etx-30-4-7-gallon-non-potable-expansion-tank
store_origin: KW
region: Kuwait
---

# 4.7-gallon capacity Pre-charged 12 psi, max 60 psi pressure Carbon steel with epoxy finish Watts ETX-30 4.7-Gallon Non-Potable Expansion Tank for Closed-Loop Systems

**Brand:** watts
**Price:** KD 85.50
**Availability:** ✅ In Stock

## Summary

> 💧 Expand your system’s potential with Watts — pressure managed, performance guaranteed!

## Quick Answers

- **What is this?** Watts ETX-30 4.7-Gallon Non-Potable Expansion Tank for Closed-Loop Systems by watts
- **How much does it cost?** KD 85.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/294930000-watts-etx-30-4-7-gallon-non-potable-expansion-tank)

## 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

- • **Plug & Play Installation:** 1/2" MNPT connection and standard tire valve charging for hassle-free setup.
- • **Generous 4.7-Gallon Volume:** Handle thermal expansion like a pro—more capacity means less stress on your system.
- • **Pressure-Ready Out of the Box:** Pre-charged at 12 psi and rated up to 60 psi to keep your system safe and efficient.
- • **Trusted Watts Quality Since 1874:** Join the legacy of innovation protecting the planet’s most precious resource.
- • **Built to Last with Premium Carbon Steel:** Epoxy finish and durable membrane ensure longevity and minimal air loss.

## Overview

The Watts ETX-30 is a 4.7-gallon non-potable expansion tank designed for closed-loop hydronic heating systems. Constructed from high-quality carbon steel with an epoxy finish, it features a durable expansion membrane to minimize air loss. Pre-charged at 12 psi and rated for pressures up to 60 psi, it mounts easily with a 1/2" MNPT connection and standard tire valve charging port. Ideal for commercial and residential use, it controls thermal expansion to protect system integrity and enhance longevity.

## Description

The Watts Non-Potable Water Expansion Tank, with a generous 4.5-gallon volume, is expertly designed for use in both commercial and residential closed loop hydronic heating systems. Its primary function is to control the thermal expansion of hot water, ensuring that system pressure remains below the relief setting of the relief valve and preventing overpressure situations.Constructed from high-quality carbon steel with a durable epoxy finish, this expansion tank is built to last. The tank features an expansion membrane that effectively minimizes the loss of the air charge, guaranteeing a long and trouble-free operational life for the entire heating system.The design of this water expansion tank allows for straightforward installation, as it mounts directly to the supply piping. It includes a 1/2" MNPT system connection and a 0.302-32" charging valve connection, which is a standard tire valve, facilitating easy on-site charging and maintenance.Pre-charged at 12 psi, this expansion tank is ready for immediate integration. With a maximum pressure rating of 60 psi, the Watts Non-Potable Water Expansion Tank is capable of handling significant pressure fluctuations. It works seamlessly in conjunction with hot water heaters to absorb increased water volume, thus preventing system overpressure. This feature not only ensures the safety of the system but also enhances its efficiency and longevity. Whether in a residential or commercial setting, this expansion tank provides a reliable solution for managing the thermal expansion of non-potable water in closed loop hydronic heating systems.

Review: Excellent replacement tank. - Item replaced original. Works great.
Review: Perfect Fit and Replacement. Watts is what you need!! - Perfect Fit and replacement. Purchased the EXT-30 to replace my failed Flextrol expansion tank purchased 12/2020. Apparently the bladder failed, causing my hydronic heating system to increase pressure causing the pressure pop off valve to drip. The old tank was small, 2.1 gallon size. When researching replacements, I accidently ordered the 4.5 gallon. Thankfully it just barely fit. I have three zones and fingers crossed the larger capacity will endure less stress during the repeating thermo cycling. Watts tank is well built, came pre charged at 12 psi. Spun right on 1/2 mnpt connection. Ordered on Monday, delivered Wednesday and 30 minutes later was installed. Pressures have maintained, no leaks, and zero worries. Btw, I called the plumbing supply store where I purchased the Flextrol in 2020, I believe it was less than 100 bucks, wanted a whopping $150.

## Features

- WATER EXPANSION TANK: With a generous 4.5 tank gallon volume, the Watts Non-Potable Water Expansion Tank is designed 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.
- DURABLE CONSTRUCTION: This tank is constructed from high-quality carbon steel with an epoxy finish, ensuring long-lasting performance. It is also equipped with a durable expansion membrane that minimizes the loss of the air charge.
- VERSATILE MOUNTING: This tank is designed for easy installation, mounting directly to the supply piping. It features a 1/2" MNPT system connection and a 0.302-32" charging valve connection (standard tire valve) to facilitate on-site charging.
- HIGH PRESSURE CAPACITY: Pre-charged at 12 psi, this expansion tank is built to withstand the demands of hydronic heating systems, boasting a maximum pressure rating of 60 psi. It works in tandem with hot water heaters to absorb increased water volume, preventing system overpressure and ensuring the longevity and efficiency of the heating system.
- EVERY DROP COUNTS: Water. It's in our name and close to our hearts. Since 1874, Watts Water Technologies has been delivering innovative technologies that make the world's most precious resource safe and accessible. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers. Our family of brands offers one of the most varied product lines in the world, with world-class, water-related solutions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0086DDNEI |
| Country of Origin | USA |
| Generic Name | Non-Potable Expansion Tank for Closed-Loop Systems |
| Included Components | Expansion Tank |
| Item Dimensions LxWxH | 27.4 x 28.2 x 37.6 Centimeters |
| Item Weight | 3 kg 630 g |
| Item model number | ETX-30 |
| Manufacturer | Watts |
| Net Quantity | 1.0 Count |
| Product Dimensions | 27.43 x 28.19 x 37.59 cm; 3.63 kg |

## 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 4.7-Gallon Non-Potable Expansion Tank for Closed-Loop Systems - Image 1](https://m.media-amazon.com/images/I/51mEF4g1JWL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent replacement tank.
*by A***R on 15 May 2021*

Item replaced original. Works great.

### ⭐⭐⭐⭐⭐ Perfect Fit and Replacement. Watts is what you need!!
*by W**** on 8 March 2025*

Perfect Fit and replacement. Purchased the EXT-30 to replace my failed Flextrol expansion tank purchased 12/2020. Apparently the bladder failed, causing my hydronic heating system to increase pressure causing the pressure pop off valve to drip. The old tank was small, 2.1 gallon size. When researching replacements, I accidently ordered the 4.5 gallon. Thankfully it just barely fit. I have three zones and fingers crossed the larger capacity will endure less stress during the repeating thermo cycling. Watts tank is well built, came pre charged at 12 psi. Spun right on 1/2 mnpt connection. Ordered on Monday, delivered Wednesday and 30 minutes later was installed. Pressures have maintained, no leaks, and zero worries. Btw, I called the plumbing supply store where I purchased the Flextrol in 2020, I believe it was less than 100 bucks, wanted a whopping $150.

### ⭐⭐⭐⭐⭐ 👍👍👍
*by K***S on 23 December 2023*

Worked perfectly.

## 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 Kuwait*
*Store origin: KW*
*Last updated: 2026-02-19*