Oil-Filled Radiator Heater

Overview

An oil-filled radiator heater warms a room by heating a sealed body of oil and letting that warm metal radiate and convect heat into the air. There is no fan and no glowing element exposed to the room, so it runs almost silently and the Finned Oil Column surface stays warm rather than scorching. The oil is a heat-storage medium, not a fuel: it is sealed in at the factory, never burned, and never needs refilling.

The heart of the unit is the Finned Oil Column, a welded stack of finned steel sections filled with diathermic oil. An Immersion Heating Element immersed at the base heats the oil; warmed oil rises and circulates through the fins by natural convection, spreading heat across the whole surface. Two layers of safety, a Thermal Fuse and a Tip-Over Safety Switch, cut power if the unit overheats or is knocked over. A Bimetal Thermostat holds the room near a set temperature, and a Control Module board manages the power stages and timer. The whole heater rolls on a Caster Base Frame.

How it works

Current through the immersion Immersion Heating Element turns electrical energy into heat directly in the oil. The warmed oil expands and rises inside the sealed fins, drawing cooler oil up from below in a continuous convective loop, so the entire Finned Oil Column reaches a fairly even temperature. The large finned surface then gives that heat to the room, partly as radiant heat to nearby objects, mostly as a gentle convection current of warm air rising off the fins. Because the steel and oil store a lot of heat, the radiator keeps warming the room for a while after the element switches off, which smooths out temperature swings.

Control is deliberately simple. The Bimetal Thermostat uses a Bimetal Disc that flexes as it warms and opens the heating contacts at the dialed-in point, then closes them again as the room cools. The Wattage Selector Switch selects one, two, or all heating stages for low/medium/high output. Independent of any of that, the Thermal Fuse permanently opens the circuit if the oil ever runs too hot, and the Tip-Over Safety Switch kills power the instant the heater leaves vertical, the two failsafes that let it be left running unattended.