Best Cheap Heater... simply get a flower pot and a couple bricks and a good size candle and I promise it will keep a vehicle warm enough to tolerate... : r/carcamping
Clay Pot Heater: A Simple and Effective Emergency Heat Source
Terracotta pot heater made with just 3 IKEA items - IKEA Hackers
The Myth of Clay Pot Heaters - Do They Work? - Garden Myths
flower-pot-candle-heater | The Savannah Arsenal Project
5 Inch Flower Pot Heater. This is a Ready to Use Candle - Etsy