---
product_id: 89503356
title: "18x20 Water to Air Heat Exchanger Hot Water Coil Outdoor Wood Furnace"
brand: "outdoor furnace supply"
price: "€ 768.40"
currency: EUR
in_stock: true
reviews_count: 7
category: "Outdoor Furnace Supply"
url: https://www.desertcart.sk/products/89503356-18x20-water-to-air-heat-exchanger-hot-water-coil-outdoor
store_origin: SK
region: Slovakia
---

# 1" seamless copper connections 133,086 BTU max output 12 fins/inch aluminum fin spacing 18x20 Water to Air Heat Exchanger Hot Water Coil Outdoor Wood Furnace

**Brand:** outdoor furnace supply
**Price:** € 768.40
**Availability:** ✅ In Stock

## Summary

> 🔥 Turn your wood furnace into a heat powerhouse — stay warm, stay ahead!

## Quick Answers

- **What is this?** 18x20 Water to Air Heat Exchanger Hot Water Coil Outdoor Wood Furnace by outdoor furnace supply
- **How much does it cost?** € 768.40 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/89503356-18x20-water-to-air-heat-exchanger-hot-water-coil-outdoor)

## Best For

- outdoor furnace supply enthusiasts

## Why This Product

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

## Key Features

- • **Precision Fin Design:** 12 fins per inch aluminum fins maximize heat exchange efficiency.
- • **Powerful Heat Transfer:** Delivers up to 133,086 BTU with optimal water and airflow for rapid warmth.
- • **Universal Compatibility:** Works seamlessly with any outdoor wood furnace or hot water source.
- • **Shipping-Proof Packaging:** Double-wall box with foam and metal port protectors guarantees damage-free delivery.
- • **Durable Copper Construction:** Seamless 1" copper tubes ensure leak-free, corrosion-resistant performance.

## Overview

This 18x20 Water to Air Heat Exchanger features seamless 1" copper connections and tightly spaced aluminum fins to efficiently transfer heat from outdoor wood furnaces or boilers into your forced air system. Rated for 175 psig and 350°F, it delivers up to 133,086 BTU, backed by a limited lifetime warranty and robust packaging to ensure flawless arrival.

## Description

This unit is a Water to Air Heat Exchanger for use in your hot air plenum of your existing forced air furnace. This unit is most commonly used in conjuction with an outside wood furnace to transfer heat into your existing forced air system. It can also be used with any other source of hot water such as a boiler to create hot air. This exchanger is for use with ANY outdoor wood stove and also features quality aluminum fins with seamless copper tubes.Features & BenefitsThese exchangers use Lead-Free solder and can be used with potable waterOur coils are packaged the best possible way to minimize shipping damage The coils fit snuggly in the boxes to minimize movement within the box There are strips of styrofoam all the way around the manifold to prevent damage if dropped The entire coil is packaged in a double wall, cardboard box These are also packaged with metal port protectors over the inlet/outlet ports to protect them from shipping damage Product SpecificationsFinned Area: 18" x 20"Overall Dimensions: 18-1/4" x 22" x 3-1/2" thickOverall Dimesions (including Copper Manifold): 18-1/4" x 25" x 3-1/2" thickRows of Tubes: 3 (3/8" Seamless Copper)Inlet/Outlet: 1" Copper SweatRating: 175 psig/350°FFin Spacing: 12/inch Performance Data133,086 BTU with 180°F Entering Water Temp., 15 GPM and 2000 CFM (air flow)We do our best to offer a high quality product that will not be damaged during shipping and you will not have to return due to manufacturers defects such as leaking.We stand behind the exchangers with a Limited Lifetime Warranty against manufacturer defects .A free copy of the written warranty is available upon request.

Review: Best value good quality, fast shipping. Highly recommended - Bought a used Hardy wood furnace that came with two exchangers. Unfortunately both were left in the cold and cracked rendering useless. We purchased this unit due to the best price out there and free shipping, not expecting much when it arrived it looked exactly like the one we needed, installed it the next day and it works spectacular. 2 days in use and blowing serious heat. Time came quickly and priced right Cardinal Classics NE-AR
Review: Good quality unit - I connected this to our wood boiler heater lines and I mounted a 20" box fan behind it, controlled by a thermostat controller, and use it to heat our 15'x25' greenhouse. Works great and the greenhouse stays toasty warm all winter!

## Features

- 1" Copper Connections

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07HDSCPPP |
| Best Sellers Rank | #431,830 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,206 in Heaters & Heater Accessories |
| Date First Available | January 9, 2013 |
| Manufacturer | Outdoor Furnace Supply |
| Package Dimensions | 27 x 20 x 5 inches |

## Images

![18x20 Water to Air Heat Exchanger Hot Water Coil Outdoor Wood Furnace - Image 1](https://m.media-amazon.com/images/I/617hlDYBjFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best value good quality, fast shipping. Highly recommended
*by C***R on December 14, 2025*

Bought a used Hardy wood furnace that came with two exchangers. Unfortunately both were left in the cold and cracked rendering useless. We purchased this unit due to the best price out there and free shipping, not expecting much when it arrived it looked exactly like the one we needed, installed it the next day and it works spectacular. 2 days in use and blowing serious heat. Time came quickly and priced right Cardinal Classics NE-AR

### ⭐⭐⭐⭐⭐ Good quality unit
*by L***1 on November 28, 2023*

I connected this to our wood boiler heater lines and I mounted a 20" box fan behind it, controlled by a thermostat controller, and use it to heat our 15'x25' greenhouse. Works great and the greenhouse stays toasty warm all winter!

### ⭐⭐⭐⭐⭐ Good replacement.
*by J***N on September 15, 2022*

I needed to modify my casing for the unit, but worked out great. I heat a 32x40 pole barn well insulated. I have no complaints about the unit.

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**Shop now:** [https://www.desertcart.sk/products/89503356-18x20-water-to-air-heat-exchanger-hot-water-coil-outdoor](https://www.desertcart.sk/products/89503356-18x20-water-to-air-heat-exchanger-hot-water-coil-outdoor)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-14*