---
product_id: 538862024
title: "in-Line Thermal Expansion"
brand: "zilmet"
price: "S$139"
currency: SGD
in_stock: true
category: "Zilmet"
url: https://www.desertcart.sg/products/538862024-in-line-thermal-expansion
store_origin: SG
region: Singapore
---

# Operates safely up to 210°F Exclusive polypropylene liner for corrosion resistance 150 PSIG max pressure rating in-Line Thermal Expansion

**Brand:** zilmet
**Price:** S$139
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of water heater woes with corrosion-proof, leak-free thermal expansion!

## Quick Answers

- **What is this?** in-Line Thermal Expansion by zilmet
- **How much does it cost?** S$139 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/538862024-in-line-thermal-expansion)

## Best For

- zilmet enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Durable epoxy-polyester coating delivers an appliance-grade finish that resists wear.
- • **Leak-Free Assurance:** Protected pre-charge valve eliminates potential leak paths for worry-free operation.
- • **Versatile Installation:** Compact 2.1-gallon design fits perfectly on 40-50 gallon water heaters, install vertically or horizontally.
- • **Corrosion-Proof Confidence:** Polypropylene liner ensures zero internal rust, extending tank life.
- • **Pressure-Ready Performance:** Factory precharged at 40 PSIG and rated for 150 PSIG max pressure to handle your home’s demands.

## Overview

The Zilmet ZEP5 In-Line Thermal Expansion Tank is a compact, 2.1-gallon carbon steel tank designed to protect your hot water system from pressure fluctuations. Featuring an exclusive polypropylene liner to prevent internal corrosion, a durable epoxy-polyester coating, and a protected pre-charge valve, it operates safely up to 210°F and 150 PSIG. Factory precharged at 40 PSIG, it installs easily on the cold water line of 40-50 gallon water heaters, offering reliable, long-lasting performance.

## Description

A Thermal Expansion Tank can be added to your hot water tank at any time. It does not need to be done when your are replacing an old tank. But if you are replacing a water heater, you should add a thermal expansion tank! A Thermal Expansion Tank for use on storage tank hot water heaters is typically a small carbon steel tank - usually either 2.1 gallons or 4.5 gallons. They are lined with a rubber membrane to help protect the tank from corrosion. They are designed to be installed on the cold water line. The ZEP5 can be installed vertically or horizontally (as long as it is fully supported independently from the piping). The ZEP5 is a 2.1 gallon tank and is perfect for use with hot water tanks from 40 - 50 gallons. The set point for this type of tank is 150°F. The ZEP5 comes with a factory pre-charge of 40 psi. This may need to be adjusted depending on the water pressure in your home. Brass plumbing fittings are recommended for installation as they will tend to last longer. The thermal expansion tank is typically installed on the cold water line.

## Features

- Exclusive polypropylene liner eliminates internal corrosion
- External baked epoxy-polyester coating provides a durable appliance like finish
- Protected pre charge valve eliminates potential leak path
- 150 PSIG max pressure rating
- Carbon Steel Shell
- Stainless Steel Connection
- Butyl fixed membrane
- Max operating pressure: 150 PSIG
- Operating temperature: 210°F
- Factory precharge: 40 PSIG

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C9PC3KPW |
| Batteries Required? | No |
| Best Sellers Rank | #347,022 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #94 in Hydraulic Tanks & Reservoirs |
| Color | White |
| Date First Available | June 28, 2023 |
| Included Components | Expansion Tank |
| Item Weight | 4.94 pounds |
| Item model number | ZEP5 |
| Manufacturer | Zilmet |
| Material | Carbon Steel |
| Product Dimensions | 3.5 x 3.5 x 11 inches |

## Images

![in-Line Thermal Expansion - Image 1](https://m.media-amazon.com/images/I/31umM9pjWcL.jpg)

## Frequently Bought Together

- in-Line Thermal Expansion
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- 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit with Pressure Relief Valve, Clean Brass, 3/4 Inch Service Installation Valve for rheem,rinai,ecosmart,navien,noritz,takagi,bosch

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-26*