Plains Mechanical Services has serviced and repaired boilers out of Sioux City, Iowa since 1994 and joined Thermogenics in 2023. Our team works across the Midwest, with R-stamp repairs, S-stamp piping, parts, rental boilers and 24/7 emergency service.
Monthly, quarterly or annual plans, steam trap surveys, deaerator inspections and burner tune-ups.
24/7 breakdown response, retubing, refractory and code repairs under our National Board ‘R’ stamp.
A Sioux City counter stocked with new and reconditioned boiler room parts, plus delivery to your door.
Thermogenics rental steam boilers, set up, tied in and serviced by our team.
Our people design boiler rooms, run fuel and process piping, set up burners and make code repairs. That means the same Sioux City crew can take a job from the first call to the final inspection.
We hold a National Board ‘R’ stamp for repairs and alterations to boilers and pressure vessels, and an ASME ‘S’ stamp for power boilers and code power piping.
We hold rep agreements for Parker Boiler steam and hot water equipment and Industrial Combustion burners, so we quote, install and support them directly.
Thermogenics manufactures coil-tube boilers and has over 10 locations across North America. Our team draws on it for rental boilers and equipment.
Food and beverage is our largest market. We also look after hospitals, assisted living, school districts, universities, government buildings and military installations, along with corrugated and process plants.
Process steam and washdown that run every shift
Heat, hot water and sterilization steam
Campus heating plants and building boilers
Federal, state and military facility boiler plants
Steam for corrugators and paper processing lines
Process burners, instrumentation and piping
Most of the boilers we look after run hard for months and then face winters that drop to -5 °F and below. Regular visits catch a weak burner, a sticking low-water cutoff or scaling tubes before winter load exposes them. We offer monthly plans with 11 inspections a year plus an annual inspection, quarterly plans with 3 visits plus an annual maintenance visit, and annual plans.
On each visit our technicians tune combustion, test the flame safeguard and safety controls, inspect refractory and check feedwater pumps and the deaerator. We work on Hurst, Johnston, Kewanee, Parker, Cleaver-Brooks and Lochinvar boilers, and on Industrial Combustion, Weishaupt, Power Flame and Webster burners.
Failed steam traps, a struggling deaerator or hard makeup water will shorten boiler life even when the burner is well tuned. We run steam trap surveys, deaerator inspections and water softener evaluations. U.S. Department of Energy figures show systems left alone for 3–5 years can have 15% to 30% of traps fail; regular surveys bring that to less than 5%.
We tell you what we found and what to plan for. When a boiler is near the end of its life, we plan the replacement and supply the equipment: high and low pressure steam and hot water boilers, thermal fluid heaters, burners, domestic hot water heaters and water treatment equipment.
We also offer industrial maintenance. Our technicians can supplement your plant staff, working alongside your maintenance team on boiler room and plant equipment during busy periods, outages or staffing gaps.
When a boiler trips on a weekend or fails on a cold morning, call our 24/7 emergency line. We handle burner and flame safeguard faults, low-water trips, pump failures, tube leaks and refractory damage on steam and hot water boilers. First we get the boiler running again, then we find out why it failed: a control, a water problem or something else in the system.
With service technicians, welders and pipefitters on one crew, most repairs stay with one team. We retube boilers, repair individual tubes, reline refractory and castable insulation, and rebuild or replace pumps. On combustion work we service Industrial Combustion, Weishaupt, Power Flame, Webster, Maxon and Cleaver-Brooks burners, with Fireye, Siemens, Autoflame and Honeywell controls.
Pressure-part work has to be done to code. We make repairs and alterations under our ‘R’ stamp and build code power piping under our ‘S’ stamp. When replacement makes more sense than repair, we design and install burner retrofits, new boilers and boiler room upgrades as turn-key engineered projects.
Industrial sites often require contractor safety qualification before anyone sets foot inside. We are qualified with ISNetworld and a member of Avetta, and our technicians hold the required OSHA certifications. Your safety department can clear us ahead of time, so paperwork does not hold up an emergency call.
Our parts counter is open Monday to Friday, 7:00 AM to 5:00 PM, and stocks new and reconditioned boiler room parts. Plant staff can walk in, call ahead or have a technician bring parts on a service visit. We also deliver to your door.
Pumps are a common bottleneck. Replacement pumps can take months to arrive, so we repair pumps and help plan replacements before one fails. What we do not keep on the shelf, we source through Thermogenics and OEM partners including Fireye, Siemens, Honeywell, Bell & Gossett and Fisher.
Controls & burner brands
Send us the nameplate data or a photo of the part, and we will match it or find a replacement.
Tell us your process, steam pressure, fuel, voltage, water, NOx limits and where a rental could sit.
Most rental boilers go out after a failure, when a repair will take weeks or a new boiler is months away. Through Thermogenics we supply containerized Thermocoil steam boilers from 150 to 500 HP, built to a 250 psig MAWP and run at 70–225 psig on natural gas, propane or No. 2 oil. They travel in standard sea-can containers with no oversize escorts, and setting them takes a crane or a lowboy trailer. For larger or different needs, partner inventory runs from 30 BHP to 2,200+ BHP.
Our Sioux City team handles the local side. We walk the site with you, plan the steam and condensate tie-in, start the unit up and service it for as long as it is on rent. The steam connection usually sets the schedule: where the unit sits and how far it is from your plant steam line matter, and a 400 ft run can mean 2–3 weeks of piping.
The containerized fleet is built and maintained by Thermogenics. Each unit is inspected and tested before deployment and comes with installation, maintenance and 24/7 repair support.
| Unit type | Thermocoil coil-tube steam boilers in sea-can containers |
|---|---|
| Size | 150 to 500 HP per unit; larger on request |
| Pressure | 250 psig design (MAWP), operating 70–225 psig |
| Fuel | Natural gas, propane or No. 2 oil |
| Containers | Two-boiler 40 ft, or single 20 ft and 30 ft units |
| Network range | 30 BHP to 2,200+ BHP through Thermogenics partners |
Thermogenics rental specifications. Units are matched to your load from the Thermogenics fleet and partner inventory; call for current availability.
Visit plainsboiler.com
From Sioux City our team covers Siouxland, including South Sioux City, Dakota City, Le Mars, Vermillion, Yankton and Cherokee, and works across the Midwest, as far as Fargo, Minneapolis, Pierre, Garden City, Kansas and Fort Morgan, Colorado. Sioux Falls is about 90 miles away and Omaha about 100, each about 1.5 hours by road. Lincoln is about 130 miles, or 2.5 hours, and Des Moines about 200 miles, or 3 hours.
Cities & towns we serve
Thermogenics
4426 Mt Carmel Tobasco Rd., Suite A · 513-528-0500
≈ 670 mi away
Matt Marshall & Co.
2249 Bishop Road · 336-292-8477
≈ 990 mi away
High Desert Mechanical
1527 E 17th Ave · 480-292-6550
≈ 1,040 mi away
Pyro Combustion & Controls
2969 S Highland Drive · 702-384-7976
≈ 1,090 mi away
Case studies and articles from across the Thermogenics group, the engineering and equipment network now behind the Plains Mechanical Services team.
Thermocoil boilers in the same footprint as the old firetubes more than doubled steam generation.
Read more
Worn firetubes replaced with high-pressure Thermocoil boilers, a condensate and deaerator system, and fast-acting controls.
Read more
How sterilization, humidification and lab loads shape boiler selection as hospitals move other loads to low-grade heat.
Read moreOur 24/7 emergency line, 712-252-4797, is answered nights and weekends. Tell us the boiler make, what it is doing and any lockout codes on the flame safeguard, so the technician arrives knowing what to look for.
We service Hurst, Johnston, Kewanee, Parker, Lochinvar, Aerco, Williams & Davis, Cleaver-Brooks, Weil-McLain, Superior, Burnham and Fulton boilers. That covers high and low pressure steam and hot water boilers, thermal fluid heaters and domestic hot water heaters. On the burner side we service Industrial Combustion, Weishaupt, Power Flame, Webster, Maxon and Cleaver-Brooks, with Fireye, Siemens, Autoflame and Honeywell controls. If your make is not listed, call and ask.
Yes. We supply Thermogenics containerized steam boilers, and we also have our own rental partnerships outside Thermogenics for larger or different units. Our team walks your site, plans the tie-in, starts the unit and services it while it is on rent. Tell us early where the unit could sit and how far that is from your steam header, since the steam connection usually drives the schedule.
We hold a National Board ‘R’ stamp for boiler and pressure vessel repairs and alterations, and an ASME ‘S’ stamp for power boilers and code power piping. For site access, we are qualified with ISNetworld and a member of Avetta, and our technicians hold the required OSHA certifications.
Our technicians work across the Midwest from Sioux City, as far as Fargo, Minneapolis, Pierre, Garden City, Kansas and Fort Morgan, Colorado. That includes Siouxland towns such as North Sioux City, Sergeant Bluff, Le Mars, Wayne and Onawa, and cities such as Sioux Falls, Omaha, Lincoln and Des Moines.
Yes. Plains Mechanical Services is now part of Thermogenics, and the local team and the name are the same. What changed is the support behind us: Thermogenics manufactures coil-tube boilers and runs a containerized rental fleet we can draw on.
Yes. We open and clean boilers before inspection, correct items an inspector is likely to flag and make any required repairs under our National Board ‘R’ stamp. Iowa boilers are certified by the state Boiler & Pressure Vessel Safety program (Iowa DIAL).
We schedule maintenance around production and sanitation shifts and save major work for planned shutdowns. On each visit we also check the steam traps, condensate return and feedwater that keep washdown and process steam steady.
Emergency service runs 24/7 at 712-252-4797, or email info@plainsboiler.com. Our office and parts counter are open Monday to Friday, 7:00 AM to 5:00 PM.
Request emergency service online