THERMO 2000 Mini BTH Ultra 3 Electric Boiler | 3 kW - 240V

3 kW of hot-water heat that fits on a wall and on a 20 A circuit

The smallest Mini ULTRA, for a single loop

The Mini ULTRA 3 is the entry size of Thermo 2000’s Mini ULTRA series. This wall-mounted electric boiler heats the water of a hydronic circuit: radiant floor, radiators or hot-water baseboards. It runs on a single 3 kW element, in one stage, and produces 10,236 BTU/h at 240 V according to the manufacturer.

This size is meant for projects where the heating load stays small. Think of a finished basement whose slab carries a radiant floor, a garage you want to keep at a steady temperature, a small condo heated by hydronic baseboards, or an added room with its own loop. Thermo 2000 also presents it as a possible back-up for an air-to-water heat pump or a geothermal system.

All the heat is electric: the unit produces no GHG emissions on site. It holds only 1 US gal of water and weighs 47 lb when shipped. It hangs on a wall, in the basement or in a mechanical closet, and leaves the floor free.

An electrical load that is easy to fit in

In many homes in Montreal, Laval or Longueuil, the electrical panel has little room left. The Mini ULTRA 3 draws 12.5 A at full output, and Thermo 2000 specifies a 20 A breaker with Cu 12 or Al 10 wire at 240 V. If the building is supplied at 208 V, as some apartment buildings are, the output drops to 2.2 kW (10.9 A). We factor that in from the load calculation on.

The T2 UltraSmart controller handles day-to-day comfort. It offers presets by distribution system, then adjusts the water temperature to the outdoor temperature with the supplied sensor, using three curves (MIN, STD and MAX). In mild weather it shuts the heat off; when a room needs to warm up faster, Boost mode takes over. The water temperature can be set from 50 °F to 190 °F.

What AirGreen’s installation covers

Everything starts with a free on-site estimate. We look at the hot-water loop, the electrical panel and the wall the boiler will hang on, then give you a written quote. It lists the circulator and expansion tank to plan for, since they are not among the parts Thermo 2000 supplies.

On installation day, our technicians mount the unit and connect it to the loop through its 3/4 in NPT connections. They install the supplied 30 psi relief valve, temperature and pressure gauge and drain valve, mount the outdoor sensor, then make the electrical connection. AirGreen holds RBQ licence 5645-9605-01 in ventilation, refrigeration and electrical work. We fill and purge the loop, set the controller curve and show you how to read the display.

We are a family business established in Montreal for more than fifteen years. Our crews work across Greater Montreal, on the South Shore as well as the North Shore.

Let’s talk about your project

A basement floor to warm up, a garage to keep above freezing or a small loop to replace: tell us about your situation and we will tell you whether the Mini ULTRA 3 is the right size.

Ask for your free estimate: we confirm the size, you receive a written quote, and financing is available to spread out your payments.