THERMO 2000 Mini BTH Ultra 6 Electric Boiler | 6 kW - 240V

Two 3 kW elements, two stages: a 6 kW boiler that measures out its heat

What the Mini ULTRA 6 adds

In Thermo 2000’s Mini ULTRA series, the 6 kW size marks a change. The smaller models have a single element; this one has two, 3 kW each, wired on two stages. The boiler therefore delivers its heat in two steps instead of one single 6 kW block. At full output, it produces 20,472 BTU/h at 240 V, according to the manufacturer.

The rest of the unit keeps what defines the Mini ULTRA: a compact wall-mounted cabinet weighing 47 lb when shipped, 1 US gal of water, 3/4 in NPT connections and the T2 UltraSmart controller with its outdoor sensor. The controller adjusts the water temperature to the weather with three curves (MIN, STD, MAX), shuts the heat off in mild weather and offers a Boost mode.

In a condo, a bungalow or a plex

This size suits small dwellings heated as a whole. A few typical cases:

• a Montreal condo heated by hydronic baseboards;
• a bungalow in Laval or on the North Shore with hot-water radiators;
• an old electric boiler to replace in the basement, on an existing loop;
• an air-to-water heat pump that needs electric back-up.

Each situation calls for its own checks. The circuit must be a dedicated 240 V line, with a 40 A breaker and Cu 8 / Al 6 wire according to Thermo 2000; the boiler draws 25.0 A at full output. In a building supplied at 208 V, it delivers 4.5 kW at 21.8 A, which can change the size to choose. On the water side, the loop must provide 4.1 US gpm at a 10 °F ΔT or 2.0 US gpm at a 20 °F ΔT, and respect a maximum working pressure of 30 psi.

Our installation

We start with a free on-site estimate, followed by a detailed written quote. Since Thermo 2000 does not supply the circulator and expansion tank, we include them in the quote, sized for your loop.

Our technicians mount the boiler on the wall, connect it to the loop and install the supplied parts: 30 psi relief valve, drain valve and temperature and pressure gauge. They mount the outdoor sensor, make the electrical connection under AirGreen’s RBQ licence 5645-9605-01 (ventilation, refrigeration and electrical), then fill and purge the system. Before leaving, we choose with you the preset that matches your radiators, baseboards or radiant floor.

AirGreen is a family business established in Montreal for more than fifteen years. We also install in Longueuil and across the South Shore.

Thermo 2000 warrants the tank for 15 years and the electrical and mechanical components for 2 years (parts).

Next step

Send us a description of your current system or ask for a free estimate: you will receive a written quote, and financing is available if you prefer to spread out your payments.