screw plug Heaters

Heating for process tanks and vessels



Screw Plug Heaters to fit your requirements,
including different sizes, materials, and wattage.

Easy Installation

Screw plug fitting can be screwed into the threaded opening of a tank, vessel, pipe or machine component.


Available in a variety of size and material combinations to meet your application needs.

Compact Design

Convenient for use in tight spaces.

Customizable Specifications

Need a non-standard shape, or a replacement for a discontinued heater?
With 70 years experience in the industry there isn’t much we haven’t built before.
Send us a picture or a sketch and we can engineer it for you.


Custom heaters can be supplied with voltages up to 600V


Built to conform to space available

Screw Plug Fittings

Standard North American NPT fittings available in 1”, 1¼”, 1½”, 2” 2½” and 3” sizes. Standard British Parallel Pipe fittings available in 1½” and 2” sizes.

Screw Plug Material

Available in various alloys including Steel, Stainless Steel, Titanium and other specialty alloys

Element Sheath Material

Standard materials include copper, stainless steel, titanium, and Incoloy. Specialty alloys include Hastelloy, Incoloy 600, Monel, Alloy 20.

Wattage and Watt Densities

Custom made heaters can be designed with any requested wattage or watt density rating

Element Numbers

Element numbers available in configurations of 1, 2, 3 or 6 for increased heat output. Element spacers available.

Terminal Boxes

NEMA 1, NEMA 4, NEMA 4/7/9 available

Thermostat, Thermocouples and Thermowells

May be added to any heater per your specifications

Electro-polish and Passivation


Technical Drawings

Almost 70 Years

Heatmax History

When it comes to business management theory we’ve proudly gone against the grain, we’ve kept ourselves nimble and self-reliant in an industry full of race-to-the-bottom consolidation and outsourcing.

We take pride in the craftmanship that goes into our products and are committed to living up to the quality mark “made in the USA”. We treat our staff as well as we treat our customers. Proudly employ hard-working people of all backgrounds and support our local community. It’s just right.