---
product_id: 98378822
title: "Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable"
brand: "watts"
price: "A$680"
currency: AUD
in_stock: false
reviews_count: 13
url: https://www.desertcart.com.au/products/98378822-watts-plt-35-potable-water-expansion-tank-3-4-in
store_origin: AU
region: Australia
---

# 3/4 in male inlet 14 gal capacity 150 PSI max pressure Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable

**Brand:** watts
**Price:** A$680
**Availability:** ❌ Out of Stock

## Summary

> 💧 Elevate your water system’s game with Watts — where durability meets precision!

## Quick Answers

- **What is this?** Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable by watts
- **How much does it cost?** A$680 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/98378822-watts-plt-35-potable-water-expansion-tank-3-4-in)

## 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

- • **Pressure-Smart Design:** Keeps system pressure below T&P relief valve settings to prevent leaks and costly downtime.
- • **Robust 14-Gallon Volume:** Handle thermal expansion like a pro with ample capacity for steady system performance.
- • **Certified Quality Assurance:** IAPMO listed and ANSI/NSF 61 certified for peace of mind in safety and compliance.
- • **Copper-Lined Steel Durability:** Engineered with FDA-approved liners and Butyl rubber diaphragm for long-lasting, contamination-free water.
- • **Field-Adjustable & Pre-Charged:** Pre-set at 20 PSI and ready to customize on-site for perfect pressure balance.

## Overview

The Watts PLT-35 Potable Water Expansion Tank is a 14-gallon, field-adjustable steel tank designed for residential water heaters. Featuring a 3/4 inch male inlet and pre-charged at 20 PSI, it withstands pressures up to 150 PSI. Its copper-lined steel construction with FDA-approved polypropylene liner and Butyl rubber diaphragm ensures long system life by preventing air-to-water contact. Certified by IAPMO and ANSI/NSF 61, it maintains balanced pressure to protect your water system and reduce maintenance.

## Description

The Watts PLT Series Potable Water Expansion Tank is specifically designed for use with gas, oil, or electric direct-fired residential water heaters and hot water storage tanks to manage the increased volume of water caused by thermal expansion. This field-adjustable steel tank is pre-charged with air at 20 psi, has a substantial volume of 14 gallons, and features a 3/4 inch male inlet connection. With a maximum pressure rating of 150 psi (10 bar), it is built to handle significant pressure levels. The tank's construction includes a polypropylene liner and a Butyl rubber diaphragm, coupled with copper-lined steel and an expansion membrane that prevents air-to-water contact, ensuring extended system life. The Watts PLT Series tank helps save time and trouble by maintaining balanced pressure throughout the water supply system, keeping system pressure below the T&P relief valve setting. It is IAPMO listed and ANSI/NSF 61 certified, ensuring both quality and compliance with safety standards.At Watts, our family of brands offers one of the most varied product lines in the world. Simply put, if you're moving, removing, heating, treating, or reusing water, we have everything you need to get the job done. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers. From melting ice on entire city blocks from the ground up, to filtering safe drinking water in isolated, weather disaster zones, you need water and water needs Watts.

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.
Review: Better pricing - Easy to install. Better pricing than from the Big Box store. Good quality.

## Features

- WATER EXPANSION TANK: The Watts PLT Series potable water expansion tank is used on gas, oil, or electric, direct-fired, residential water heater and hot water storage tank applications to absorb the increased volume of water created by thermal expansion.
- COMPREHENSIVE FEATURES: This field-adjustable steel tank is air pre-charged at 20 psi, has a volume of 14 gallons, and 3/4 inch male inlet connection. The maximum pressure is 150 psi (10 bar).
- DURABLE CONSTRUCTION: Designed with a Food and Drug Administration-approved polypropylene liner and Butyl rubber diaphragm, copper-lined steel, and an expansion membrane that prevents air-to-water contact in the tank, ensuring a long system life.
- SAVE TIME AND TROUBLE: Our potable water expansion tank also maintains balanced pressure throughout the water supply system by keeping system pressure below the T&P relief valve setting. IAPMO listed and ANSI/NSF 61 certified.
- 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 | B0035J4WA2 |
| Best Sellers Rank | #125,794 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #182 in Water Heaters |
| Date First Available | January 22, 2010 |
| Department | Expansion Tanks |
| Item Weight | 27 pounds |
| Item model number | PLT-35 |
| Manufacturer | Watts |
| Product Dimensions | 23 x 16.5 x 16.5 inches |

## Images

![Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable - Image 1](https://m.media-amazon.com/images/I/31BJcCVhfvL.jpg)
![Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable - Image 2](https://m.media-amazon.com/images/I/51iYI8dZ7LL.jpg)

## Customer Reviews

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

### ⭐⭐⭐⭐⭐ Better pricing
*by P***N on August 14, 2025*

Easy to install. Better pricing than from the Big Box store. Good quality.

### ⭐⭐⭐⭐⭐ Worked Just Fine!
*by K***T on December 20, 2025*

OEM. Worked Just Fine!

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-03*