Industrial Heater Repair, Design, and Replacement for Circulation, Immersion, Duct, and Flange Heaters

When an industrial process heater fails, the first question is rarely whether it can be repaired. The first question is whether it should be repaired, replaced, or redesigned. The wrong answer costs money in either direction. Replace a heater that could have been repaired and you pay for new equipment unnecessarily. Repair a heater that has reached the end of its design life and you pay for the same failure twice.

We perform diagnostic, repair, design, and replacement work on industrial process heaters across the Gulf Coast region. The work covers process heaters—including circulation, immersion, in-line, and packaged skid heaters from Chromalox, Indeeco, NextThermal, and other manufacturers. Our team starts every service call with a root-cause diagnosis, not a quote.

When Industrial Heaters Fail and Why Root-Cause Matters

Industrial process heaters fail in patterns. Circulation heater elements burn out from coking, scaling, or running dry. Immersion heater seals fail from thermal cycling and chemical attack on the heater housing. In-line and package skid heaters fail due to overheating/element burnout, scale buildup, corrosion, or control system malfunctions. Flange heater wells corrode at the boundary between the heated fluid and the insulation jacket.

Each failure pattern has a different cause and a different solution. A burnt-out element on a heater that has been running clean is replaceable for the cost of the element. A burnt-out element on a heater that is suffering from chronic scaling will burn out the new element within months unless the underlying cause is addressed.

WilsherCo - Industrial Heaters Root-Cause Analysis

Root-cause analysis is the difference between paying once and paying repeatedly. Our diagnostic process for every heater service call:

  1. Visual inspection of the heater, its installation, and the connected piping or ductwork
  2. Electrical testing to identify failed elements, ground faults, and wiring issues
  3. Process review to identify operating conditions that may be contributing to repeated failures (temperature cycling, flow rate, fluid contamination, control strategy)
  4. Documentation review to compare current conditions against the original heater specification
  5. Recommendation: repair, replace, or redesign, with the reasoning documented

The diagnostic deliverable is a written report. From there, the customer decides whether to proceed with repair, replacement, or a redesign that addresses the underlying cause.

Heater Types We Service

Our service capability covers the major industrial heater types installed in process plants:

WilsherCo - Circulation Heaters

Circulation Heaters

Circulation heaters are packaged units that heat a flowing medium through built-in heating elements inside a heating chamber. The heater receives flow on the inlet, heats it through internal elements, and discharges heated fluid on the outlet. Common applications: process water heating, lube oil heating, fuel oil heating, and chemical preheat. We service circulation heaters from Chromalox, Indeeco, NextThermal, and other manufacturers. Repair work typically covers element replacement, thermostat repair, controller replacement, gasket and seal replacement, and heater rebuild for full-scope refurbishment.

WilsherCo - Immersion Heaters

Immersion Heaters

Immersion heaters are direct-contact heaters where the heating elements are submerged in the fluid being heated, typically through a flange or threaded fitting on a tank or vessel. Immersion heaters operate in everything from light water heating duty to high-temperature acid and caustic service. Service work covers element replacement, sheath repair (where the element sheath has been damaged by chemical attack or thermal stress), terminal box rebuild, and complete heater replacement when the housing has reached end of life. Material selection is critical for immersion heaters in corrosive service.

WilsherCo - In-Line Heaters

In-Line Heaters

In-line heater work by instantly heating a liquid or gas as it passes through a specialized pressure vessel or pipe. Failures often involve element warping due to airflow imbalance, control failures, or burnout from low-flow conditions. Repair work covers element replacement, control redesign for airflow safety, and complete duct heater replacement.

WilsherCo - Packaged Skid Heater Systems

Packaged Skid Heater Systems

Packaged skid heaters are self-contained, pre-assembled systems that circulate a process fluid or gas through integrated heat exchangers, heaters, pumps, and automated controls—delivering a ready-to-use “plug-and-play” solution. Common in industrial process applications where heating capacity is needed beyond what standard immersion heaters provide. Repair work covers element replacement, mechanical component replacement, control system repair and replacement, and full flange heater rebuild.

Brands We Service

We are not limited to a single brand. Our heater service capability covers most major industrial heater manufacturers, including:

  • Chromalox: circulation heaters (CHRO, CHPES, ARMTO), immersion heaters (ARMTO, DHTI, DHO), flange heaters, duct heaters.
  • Indeeco: open coil duct heaters, finned tubular heaters, immersion heaters.
  • NextThermal: electric process heaters and heater elements.
  • Watlow, Tempco, and other manufacturers as service work requires.

Heater Design and Replacement (When Repair Is Not Viable)

Some heater failures are not worth repairing. When a heater is at the end of its design life, when the original specification was wrong for the actual operating conditions, or when a redesign would solve a chronic failure pattern, replacement is the right answer.

Our heater design and replacement work covers specification review (confirming the heater matches the actual process conditions, not the original design assumptions), sizing calculations (wattage, flow rate, temperature rise, pressure drop), material selection (sheath material, terminal materials, wetted parts for corrosive service), controls integration (matching the new heater to the existing or upgraded plant controls), and commissioning.

For applications where the heater is part of a larger process heating system, we coordinate the heater replacement with the broader Process Heating and Temperature Maintenance scope.

WilsherCo - Work with Us

Work with WilsherCo

For customers who know what they need and want to source replacement equipment directly, our online product catalog includes circulation heaters, immersion heaters, and process heating components from the brands we carry.

Browse the Store

For customers who are not sure what they need, the diagnostic-first approach is usually the better path. Contact our team so we can better assess the specific heater solutions you are looking for.

Talk to an Expert

Frequently Asked Questions

Repair is usually the right answer when the heater housing is sound, the failure pattern is straightforward (element burnout, single failed thermostat, recoverable seal failure), and the underlying cause has been addressed. Replacement is usually right when the heater is at end of design life, when the original specification was wrong for the actual operating conditions, or when a redesign would solve a chronic failure. Our diagnostic process produces a written recommendation with the reasoning documented.

We service most major industrial heater manufacturers including Chromalox, Indeeco, NextThermal, Watlow, Tempco, and others. For specialty heaters or older equipment from manufacturers that have exited the market, we may need to source replacement parts from secondary suppliers, but we can usually find a path.

For repairs using stocked parts (common circulation and immersion heater elements, gaskets, controllers), lead time is relatively short. For repairs requiring custom parts or specialty manufacturer-supplied elements, lead time can be longer. We confirm lead time as part of the diagnostic report.

Yes. Heater redesign work is part of our standard scope. Common drivers: process conditions have changed since the original heater was specified, the original specification was wrong for the actual operating conditions, or a redesign is needed to solve a chronic failure pattern. The redesign work uses the same process as a new heater specification.

Warranty terms depend on the work scope and the parts used. Specific terms are documented in the project quote.