---
product_id: 27052021
title: "Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches"
brand: "o3"
price: "R$70"
currency: BRL
in_stock: false
reviews_count: 1
url: https://www.desertcart.com.br/products/27052021-ecostat-mercury-free-1-heat-1-cool-non-programmable-round
store_origin: BR
region: Brazil
---

# Battery-powered with included AAA batteries Easy 3-position HEAT/OFF/COOL switch Precise 41-90°F setpoint range Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches

**Brand:** o3
**Price:** R$70
**Availability:** ❌ Out of Stock

## Summary

> 🌿 Stay cool, stay warm, stay ahead—thermostat tech that cares.

## Quick Answers

- **What is this?** Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches by o3
- **How much does it cost?** R$70 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/27052021-ecostat-mercury-free-1-heat-1-cool-non-programmable-round)

## Best For

- o3 enthusiasts

## Why This Product

- Trusted o3 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Mercury-Free Safety:** Eco-conscious design eliminates toxic mercury, protecting your home and the planet.
- • **Backlit Push Buttons:** Illuminate your settings with push-button backlight—perfect for quick changes anytime, day or night.
- • **Intuitive Control Ring:** Soft rubber temperature ring offers smooth, tactile adjustments for effortless comfort tuning.
- • **Universal Compatibility:** Works seamlessly with 24V single-stage heating and cooling systems, including gas and oil boilers.
- • **Hassle-Free Installation:** Comes with extra wallplate and mounting hardware for a clean, professional setup in minutes.

## Overview

The Ecostat ES100 is a mercury-free, digital thermostat designed for single-stage 24V heating and cooling systems. Featuring a large, easy-to-use mode switch and a soft rubber temperature ring, it offers precise temperature control from 41 to 90°F. With push-button backlighting and included mounting hardware, it ensures effortless installation and operation, making it the smart, eco-friendly choice for modern homes.

## 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) , Thermostat Dimensions: 3 5/8" Round, 1 3/4" Deep., System switch positions - HEAT / OFF / COOL , Fan switch positions - AUTO / FAN ON

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | O3 |
| Controller Type | Ring, Push Button |
| Voltage | 120 Volts, 24 Volts |
| Material | Rubber |
| Display Type | Digital |
| Control Type | Button Control |
| UPC | 802587943608 |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** O3
- **Controller Type:** Ring, Push Button
- **Voltage:** 120 Volts, 24 Volts
- **Material:** Rubber
- **Display Type:** Digital

## Images

![Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches - Image 1](https://m.media-amazon.com/images/I/41-c2mbA2ML.jpg)
![Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches - Image 2](https://m.media-amazon.com/images/I/51eAeZfNr2L.jpg)
![Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches - Image 3](https://m.media-amazon.com/images/I/31nYSewXQLL.jpg)
![Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches - Image 4](https://m.media-amazon.com/images/I/31ZJ+TmT4AL.jpg)
![Ecostat Mercury-free 1 Heat/1 Cool Non-programmable Round Thermostat, Large Easy to Use Mode Switches - Image 5](https://m.media-amazon.com/images/I/41N2DJHbrJL.jpg)

## Customer Reviews

### ⭐ Really liked the simplicity
*by G***Y on May 28, 2017*

Really liked the simplicity. Just what I wanted. Gravely disappointed to discover this thermostat has no temperature hysteresis. What that means is once the room gets to the set temperature, the furnace can cycle frequently; off for the minimum selected 5 minutes, on for only a few seconds, maybe minutes, then turn off again. One time, heard the furnace fan come on for about 10 seconds, then go off.Once the thermostat tells the gas furnace to turn on, it takes about 15 seconds for the firebox to heat up enough for the fan to start running. The house is 40 years old and does not have insulated ducts, so once the fan turns on, typically takes another 15-20 seconds for the warm air to be felt at the room registers. That means there was at least 15 seconds of wasted energy that had no heating affect on the house. Even if the furnace runs for a full minute before turning off, that is only 50% efficiency.

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**Shop now:** [https://www.desertcart.com.br/products/27052021-ecostat-mercury-free-1-heat-1-cool-non-programmable-round](https://www.desertcart.com.br/products/27052021-ecostat-mercury-free-1-heat-1-cool-non-programmable-round)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-03-05*