a basic guide

a free introduction to industrial immersion heaters



A PIIB industrial immersion heater from Process Heating Services
A PIIB industrial immersion heater from Process Heating Services

Immersion heaters raise the temperature of fluids, usually water. In most cases, they consist of an element, made of a conductive metal that nevertheless presents a resistance to the electricity that flows through it. The element can be exposed to the liquid or encased inside another material.

Most people, when they refer to an “immersion heater”, mean a domestic electrical system for heating up household running water, for a bath for example. But this site is about heaters that are used for commercial purposes. These include:

  • regulation of fuel temperatures (eg to stop fuels from thickening at low temps)
  • chemical- and pharma-industry handling of ingredient and product temperatures
  • brewing and food production (including actual cooking)
  • plumbing and sewage (eg to stop pipes freezing)

Unlike domestic immersion heaters, which require only a few kilowatts of electricity, those used for such applications run up to thousands of kilowatts of power, and can be responsible for heating large volumes of fluid.

types of commercial immersion heaters

lower watts density

PHS sell stainless-steel screwplug immersion heaters with 16mm-diameter heating elements for longer life. View their PIHSS Range.

brazed not soldered

PHS sell heating elements fixed in place by brazing for greater mechanical security. Check out their PIHB range.

corrosion resistant

Immersion heater elements can be made more corrosion-resistant by manufacturing them with Incoloy 800, which has even better rust-repelling power than stainless steel. PHS has an Incoloy-800-based PII range.