Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems (Amazon Affiliate)
US: https://amzlink.to/az0kFYCYKmjCb
Alternative thermostat:
Lux Pro PSD010B-010 Mechanical Non-Programmable Thermostat, 1 Heat, 0 Cool Without Fan, Batteries Included (Amazon Affiliate)
US: https://amzlink.to/az0mjkSmwVZn8
RV/Camper Playlist: https://www.youtube.com/playlist?list=PLErU2HjQZ_ZMNttuLFFn-FrqqO1zEm1IQ