home-assistant.io/source/_components/binary_sensor.opentherm_gw.markdown

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---
layout: page
title: "OpenTherm Gateway Binary Sensor"
description: "Expose internal data from the OpenTherm Gateway."
date: 2018-10-19 18:23
sidebar: true
comments: false
sharing: true
footer: true
logo: opentherm.png
ha_category: Binary Sensor
ha_release: 0.81
ha_iot_class: "Local Push"
---
The `opentherm_gw` binary sensor platform is used to expose internal data from the [OpenTherm Gateway](http://otgw.tclcode.com/) in Home Assistant.
# {% linkable_title Configuration %}
Configuration of this platform is achieved through the [OpenTherm Gateway Hub](/components/opentherm_gw/) configuration.
<p class='note'>
The OpenTherm protocol is based on polling. The thermostat sends requests to the boiler at specific intervals. As a result, it may take some time for changes to propagate between Home Assistant and the thermostat.
</p>