bltflexitank
https://www.bltflexitank.com/products/electric-heating-pad-220v-380v/
Heat is produced by resistance wires and evenly distributed across the heating pad, effectively heating the liquid
Material: resistance wire/aluminum foil/insulation felt
Suitable for products that solidify easily at low temperatures or require specific temperature conditions. An electrical system must be provided at the unloading site.