Customizable Over-The-Side Immersion Heaters

Simple and cost-effective tank heating



Over-the-Side Heaters to fit your requirements,
including different sizes, materials, and wattage.

Mounts to the Top/Side of the Tank

Over-the-Side heaters require no tank penetration. Mounted at the top of the tank, Over-the-Side heaters put the heat along the side of the tank.

Flexibility You Need

Design allows you to remove and clean the heater without draining the tank. Low profile leaves ample working space inside the tank as needed.

Customizable to Fit Your Space

We make customized small batches of heaters to meet your exact dimensions and application requirements.

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 over-the-side heaters can be supplied with voltages up to 600V

Wattage & Watt Densities

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

Dimensions, Length, Height, and Width

Element length, height and width can be built to fit the space you are working with.

Element Sheath Material

Standard sheath materials include Copper, Stainless Steel, Titanium, Incoloy. Special materials also available including Hastelloy, Incoloy 600, Monel, Alloy 20.

Element Numbers

Element configurations of anything from one to 18 elements available.

Terminal Boxes

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

Thermostat, Thermocouples and Thermowells

Can be added to your heater on request,

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.