# \#1-wire **URL:** https://community.openenergymonitor.org/tag/1-wire/620.md [Latest](https://community.openenergymonitor.org/latest.md) · [Categories](https://community.openenergymonitor.org/categories.md) · [Tags](https://community.openenergymonitor.org/tags.md) --- ## [Low cost on/off mains sensors?](https://community.openenergymonitor.org/t/low-cost-on-off-mains-sensors/24583)
**Author:** [@JohnConnett](https://community.openenergymonitor.org/u/JohnConnett)\ **Replies:** 3\ **Last updated:** [18 October 2023 14:26 UTC](https://community.openenergymonitor.org/t/low-cost-on-off-mains-sensors/24583 "2023-10-18T14:26:17Z")
We have an underfloor heating system (UFH) with on/off mains thermostats connected to mains thermoelectric actuators for a number of zones. Heat is supplied from an air source heat pump (ASHP). We would like to monitor …