A: "Liquid filled" refers to heated towel rails that are filled with a special heating fluid. A: The short answer is, not much at all. Electric towel radiators are quite efficient, using relatively little electricity to heat and dry your towels.
Thermostatic Electric Towel Rail Radiator Dual Fuel Heating Element 150-1000W
iBathUK Seravo T-Piece for Dual Fuel Heated Towel Rail, Plumbing Connector Accessory for Dual Fuel Towel Radiators, Compatible with Hydronic and Electric Systems in Brass Chrome Plated
Towel Rail Radiator Warmer Dual Fuel Kit Electric Heating Element 150W to 1000W
Thermostatic Smart Dual Fuel Towel Rail Radiator Heating Element LCD Display
Thermostatic Electric Heating Element Warmer Dual Fuel for Towel Rail Radiator
Thermostatic Dual Fuel Towel Rail Radiator Electric Heating Element 150W-1000W