---
product_id: 24215790
title: "Emerson21M51U-843 Universal Integrated Furnace Control Kit with Three Speed Circulator"
brand: "emerson thermostats"
price: "¥82846"
currency: JPY
in_stock: true
category: "Tools &amp; Home Improvement"
url: https://www.desertcart.jp/products/24215790-emerson21m51u-843-universal-integrated-furnace-control-kit-with-three-speed
store_origin: JP
region: Japan
---

# Emerson21M51U-843 Universal Integrated Furnace Control Kit with Three Speed Circulator

**Brand:** emerson thermostats
**Price:** ¥82846
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Emerson21M51U-843 Universal Integrated Furnace Control Kit with Three Speed Circulator by emerson thermostats
- **How much does it cost?** ¥82846 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/24215790-emerson21m51u-843-universal-integrated-furnace-control-kit-with-three-speed)

## Best For

- emerson thermostats enthusiasts

## Why This Product

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

## Description

Emerson21M51U-843 Universal Integrated Furnace Control Kit with Three Speed Circulator

## Features

- Three-speed PSC (Permanent Split Capacitor) circulator output, two-speed inducer output, two-stage gas valve output
- Furnace status LED - tri-color (green, red and amber)
- Pushbutton fault history retrieval
- Heat fan off delay (dipswitch selectable), fan on delay for cooling, and auto second-stage delay
- Includes 21D64-2 Silicon Nitride ignitor kit and module

## Images

![Emerson21M51U-843 Universal Integrated Furnace Control Kit with Three Speed Circulator - Image 1](http://ecx.images-amazon.com/images/I/515t6hCfa4L.jpg)

---

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**Shop now:** [https://www.desertcart.jp/products/24215790-emerson21m51u-843-universal-integrated-furnace-control-kit-with-three-speed](https://www.desertcart.jp/products/24215790-emerson21m51u-843-universal-integrated-furnace-control-kit-with-three-speed)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-02*