THERMO 2000 BTH Ultra 480 18 Electric Boiler | 18 kW - 480V
The 480 V version of the Thermo 2000 BTH ULTRA 18 is an 18 kW commercial wall-mounted electric boiler with three 6 kW elements, for hot water heating.
Model numberBTH ULTCA 480 18
514 316-2973 · sales@airgreen.ca
Quick facts
18 kW at 480 V to heat a radiant slab or a commercial hot water loop
What the 480 V BTH ULTRA 18 is
Thermo 2000’s BTH ULTRA 18 comes in several voltages; this one is the commercial version at 480 V three phase. It delivers 18 kW, or 61,416 BTU/h, through three 6 kW elements designed for 277 V, which heat together on a single stage. Wall-mounted, it weighs 75 lb, holds 3 US gallons of water and connects with 1 1/4 in female NPT fittings.
This model suits commercial and institutional buildings supplied at 480 V. Think of a workshop or commercial garage with a heated slab, a business or showroom heated through the floor, an institutional space with radiators. Thermo 2000 designs it for new construction as well as replacement, and as backup for a geothermal system or a heat pump.
Built to last
Thermo 2000 describes the BTH ULTRA as compact, robust and easy to maintain, with no on-site GHG emissions. In a workshop or garage, it is a unit you can forget about: mounted on the wall, it leaves the floor clear. Two high limits, automatic at 208 °F (98 °C) and manual at 227 °F (108 °C), protect the boiler, and the supplied 30 psi relief valve protects the loop.
The T2 UltraSmart controller sets the water temperature from the supplied outdoor sensor, on one of three curves (MIN, STD, MAX). Warm weather shutdown rests the boiler when heat is not needed, and Boost mode remains available. The backlit display, presets by distribution system, pump purge and 24 V supply for the thermostat round out the package.
The supply to plan
At 480 V, the boiler draws 21.6 A. Thermo 2000 lists a 30 A breaker and copper or aluminum wire gauge 10. If your building is supplied at 600 V, the commercial BTH ULTRA line offers a version for that voltage: we confirm the voltage on site before choosing.
What AirGreen’s installation covers
After a free on-site estimate, you receive a written quote that describes the boiler, the 480 V electrical connection and the work on the loop. Our technicians mount the boiler, connect it to the loop (two reducers supplied) and to the electrical circuit, fill and purge the system, then set the controller for your floor or radiators. Thermo 2000 covers the tank for 15 years and electrical and mechanical components for 2 years, according to its commercial manual.
AirGreen is a family business established in Montreal for more than fifteen years, holding RBQ licence 5645-9605-01 in ventilation, refrigeration and electrical work.
Next step
We work in Montreal, Laval, Longueuil, on the North Shore and on the South Shore.
Ask for your free estimate and a written quote for your building; financing is available.
Heating a slab or a hot water loop in a 480 V building
This version of the BTH ULTRA 18 connects to a 480 V three-phase supply. Thermo 2000 designs it for commercial and institutional applications: radiant floors, radiators or hot water baseboards, in new construction or replacement.
- Workshop or commercial garage heated by a radiant slab
- Business or showroom supplied at 480 V
- Institutional space with hot water radiators
- Backup for a geothermal system or a heat pump
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- 480 VAC three-phase, 60 Hz power supply (277 V elements): 21.6 A, 30 A breaker, suggested wire copper 10 or aluminum 10. A 600 V building needs the other version in the line.
- This size runs on a single stage: its three elements heat together.
- 75 lb wall-mounted boiler, 3 US gal of water, 1 1/4 in female NPT connections (two reducers supplied).
- Maximum working pressure of 30 psi (207 kPa); 30 psi relief valve supplied.
- 30 psi relief valve
- Drain valve
- 2 reducers
- Outdoor sensor
- Temperature and pressure gauge
Manufacturer documents
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Frequently asked questions
Can it heat a workshop’s radiant slab?
Radiant floors are among the systems Thermo 2000 names for the BTH ULTRA. We confirm the output against the floor area and the building’s heating needs during the free estimate.
Which breaker and wire does it need?
Thermo 2000 lists a 30 A breaker and copper or aluminum wire gauge 10. The unit draws 21.6 A at 480 V.
My building is at 600 V: can I use it?
No, this version is designed for 480 V. The commercial BTH ULTRA line also has a 600 V version; we choose the one that matches your building.
How is the boiler protected?
By an automatic limit at 208 °F (98 °C), a manual limit at 227 °F (108 °C) and the supplied 30 psi relief valve.
What warranty does Thermo 2000 offer?
The commercial manual provides 15 years on the tank and 2 years on electrical and mechanical components.
An 18 kW, 480 V BTH ULTRA, installed by AirGreen
Tell us about your project: we check the sizing, confirm availability and send you a quote. Or let our technicians install it for you.
Specifications from the manufacturer’s documentation, checked on October 19, 2026.