---
title: "Kamstrup 403"
description: "Kamstrup 403 is a Marketplace integration for Home Assistant. It has 81 installs sharing analytics, works locally and was last updated October 27, 2026."
canonical: "https://vulpo.app/integrations/marketplace/golles-ha-kamstrup-403"
url: "https://vulpo.app/integrations/marketplace/golles-ha-kamstrup-403.md"
last-updated: "2026-10-22"
version: "1.4"
---

# Kamstrup 403

> Kamstrup 403 is a Marketplace integration for Home Assistant. It has 81 installs sharing analytics, works locally and was last updated October 27, 2026.

Kamstrup 403 is a custom integration that reads data from Kamstrup 403 heating meters into Home Assistant. It works locally and adds sensors, with most of them disabled by default to spare the meter's battery. Communication goes through an optical eye placed on the meter and connected to the machine running Home Assistant over a serial port. The port can also be a socket connection, for example through a remote serial bridge. Options cover the scan interval, which defaults to one hour, and the serial read timeout. Heat energy and flow sensors can feed the energy dashboard, and a high resolution heat energy sensor is available for meters that support it. Setup is done in the UI.

Automatic summary of the README and code of golles/ha-kamstrup\_403. Something wrong, or are you the maintainer and want your own text here? [Get in touch](https://vulpo.app/contact)

[Open in My Home Assistant](https://my.home-assistant.io/redirect/hacs_repository/?owner=golles&repository=ha-kamstrup_403&category=integration)

On Home Assistant 2026.11 or newer? [Open it in the Marketplace](https://my.home-assistant.io/redirect/marketplace_repository/?owner=golles&repository=ha-kamstrup_403&category=integration)

## Supports

- **Works locally**: Talks to your devices on your own network. No vendor cloud in between.
- **From the Marketplace**: Installed through the Marketplace, formerly HACS.
- **Actively maintained**: Its author released or pushed a change in the last six months.

## Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

### Kamstrup meter

- **Serial port**

### After setup

- **Scan interval (seconds)**
- **Serial read timeout (seconds)**

Texts from the code of [golles/ha-kamstrup\_403](https://github.com/golles/ha-kamstrup_403).

## Troubleshooting

- **Diagnostics**: Downloads a diagnostics file to attach to a bug report.

## From the README

> Kamstrup 403 custom component for Home Assistant.

From the README of [golles/ha-kamstrup\_403](https://github.com/golles/ha-kamstrup_403#readme), [MIT License](https://spdx.org/licenses/MIT.html). Shortened.

## At a glance

- Kind: Marketplace integration
- Category: [Water](https://vulpo.app/integrations/category/water.md), Meters and leak detection
- Number: 81 installs sharing analytics; 91 GitHub stars
- Connection: Works locally
- Upkeep: Updated in the last 6 months
- Needs: Needs the Marketplace (HACS on 2026.10 and older)
- Latest version: v3.2.2, last updated October 27, 2026
- Domain: `kamstrup_403`
- Source: <https://github.com/golles/ha-kamstrup_403>
- Issues: <https://github.com/golles/ha-kamstrup_403/issues>
- Screenshot: https://vulpo.app/integrations-img/ba098a16f77124b2.webp (from golles/ha-kamstrup\_403's README)
- Screenshot: https://vulpo.app/integrations-img/f9f84fb956af0e10.webp (from golles/ha-kamstrup\_403's README)
- Screenshot: https://vulpo.app/integrations-img/7e9fcd9a45f2b97a.webp (from golles/ha-kamstrup\_403's README)

In Vulpo: Chart card, Apple Watch

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about)

Last updated 2026-10-22. Source: https://vulpo.app/integrations/marketplace/golles-ha-kamstrup-403

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