---
product_id: 18577720
title: "Mercury-Free 1 Heat/1 Cool Non-Programmable Round Thermostat"
brand: "ecostat"
price: "₩6577"
currency: KRW
in_stock: false
reviews_count: 8
url: https://www.desertcart.kr/products/18577720-mercury-free-1-heat-1-cool-non-programmable-round-thermostat
store_origin: KR
region: South Korea
---

# Mercury-Free 1 Heat/1 Cool Non-Programmable Round Thermostat

**Brand:** ecostat
**Price:** ₩6577
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Mercury-Free 1 Heat/1 Cool Non-Programmable Round Thermostat by ecostat
- **How much does it cost?** ₩6577 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/18577720-mercury-free-1-heat-1-cool-non-programmable-round-thermostat)

## Best For

- ecostat enthusiasts

## Why This Product

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

## Description

Affordable thermostat for low voltage control of single-stage heating, cooling or heating-cooling systems. Familiar round appearance - simply twist the dial to desired temperature. Includes 5 1/2" optional wall plate. Features push-button light. Equivalent to Luxpro PSM011. Mercury Free! FEATURES: Push Button Backlight Mercury Free Soft Rubber Set Temperature Ring Large Easy to Use Mode Switches Easy Installation Includes extra wallplate, mounting hardware The ES100 digital thermostat is designed to work on the following 24V systems. This thermostat will not control multistage heat pump systems or 120V line voltage heating systems. Suitable for: Gas - standing pilot Gas - Electronic ignition Gas - Fired Boilers Oil - Fired Boilers Oil - Fired Furnace Single Stage Heat Pumps with no Auxiliary Heat Electric Air Conditioning Specifications: Setpoint Range: 41-90 degrees F Terminals: RH, RC, W, Y, G,B, O Power: 2 AAA Alkaline Batteries (included

Review: Great deal at $20 w/ shipping - Don't know about reliability (only installed for a few weeks), but so far works as well as the Honeywell T8775A1009 I am also using. (One of those failed after 3 years, so this can't be much worse, and is a third the cost!)
Review: Shorted out and potentially dangerous - Bought this in December 2015. I had no issues with it for the first year. But after returning from vacation in February 2016, I was greeted by a wall of heat. The thermostat was arcing on one side and was registering 95 degrees! I could not turn it down. It had shorted out and I had to shut off the oil burner switch. It must have been like this for several days because the house was so hot the linoleum tiles were curling up from the floor. It used a half tank of oil and could have been a death sentence for any elderly person in the house or even pets.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0085ZJ666 |
| Backlight | Yes |
| Brand | EcoStat |
| Brand Name | EcoStat |
| Control Type | Dial Control |
| Controller Type | Push Button |
| Customer Reviews | 3.8 out of 5 stars 13 Reviews |
| Display Type | Digital |
| Manufacturer | EcoStat |
| Shape | Round |
| Specific Uses For Product | Furnace, Heat Pump |
| UPC | 840532910060 |
| Voltage | 24 Volts |

## Images

![Mercury-Free 1 Heat/1 Cool Non-Programmable Round Thermostat - Image 1](https://m.media-amazon.com/images/I/41UGQz2V5bL.jpg)

## Questions & Answers

**Q: Do you any of you still have the install manual?  i lost my copy.  if you have yours, can you tell me what rc, rh, g, b, o, w, and y means?**
A: Call a tech. R is the hot wire , g fan , b common , w, heat, y ac

**Q: How big is the display numbers?  I am trying to find something that can be easily read by an elderly person.**
A: Display is about 1 5/8" x 1"

**Q: Is the back light on all the time or only when you press the light button or adjust the temp?**
A: Only when the button is pressed. All thermostats are the same way.

**Q: Can this be mounted without using the wall plate?**
A: Yes, the wall plate is just there to cover any areas from a larger previous thermostat.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great deal at $20 w/ shipping
*by R***S on November 29, 2014*

Don't know about reliability (only installed for a few weeks), but so far works as well as the Honeywell T8775A1009 I am also using. (One of those failed after 3 years, so this can't be much worse, and is a third the cost!)

### ⭐ Shorted out and potentially dangerous
*by D***7 on April 2, 2016*

Bought this in December 2015. I had no issues with it for the first year. But after returning from vacation in February 2016, I was greeted by a wall of heat. The thermostat was arcing on one side and was registering 95 degrees! I could not turn it down. It had shorted out and I had to shut off the oil burner switch. It must have been like this for several days because the house was so hot the linoleum tiles were curling up from the floor. It used a half tank of oil and could have been a death sentence for any elderly person in the house or even pets.

### ⭐⭐⭐ Simple thermostat gets the job done. Only gripe is ...
*by J***M on January 5, 2015*

Simple thermostat gets the job done. Only gripe is that sometimes it kicks off and then back on again within seconds. I have a second one now for my a/c zone. It's working just fine. Had a 5 minute timeout to protect the compressor from short cycling should the call for a/c come on too soon after the last call went off. No programming to go wrong, just set it and forget it.

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**Shop now:** [https://www.desertcart.kr/products/18577720-mercury-free-1-heat-1-cool-non-programmable-round-thermostat](https://www.desertcart.kr/products/18577720-mercury-free-1-heat-1-cool-non-programmable-round-thermostat)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-16*