THERMO 2000 AltSource 50 Thermal Mass Electric Boiler | 4.5 kW - 240V

A 4.5 kW electric backup with 48 US gal of stored water for your renewable-energy system

What the AltSource 50-4.5 is and who it suits

Thermo 2000’s AltSource is not an ordinary electric boiler. Its tank holds 48 US gal of water, and the manufacturer presents it as the only high water volume electric boiler on the market. It serves as the backup source of a renewable-energy heating system: an air-to-water heat pump, a geothermal system or solar collectors do most of the work, and the AltSource adds electric heat as needed.

The 4.5 kW size is the smallest in the series. It runs on a single heating element, in a single stage, and produces 15,354 BTU/h at 240 V according to Thermo 2000. It suits homes where the main source already covers most of the needs: a bungalow with radiant floor heating, a small well-insulated house, an addition tied into an existing hot-water loop.

A modest current draw for your electrical panel

In many homes in Montreal and Laval, the electrical panel is already busy: range, water heater, dryer, charging station. The AltSource 50-4.5 needs only a 30 A breaker and 10-gauge copper wire, according to the manufacturer’s data. If the building has a 208 V supply, output drops to 3.4 kW (16.3 A); we take this into account from the estimate onward.

The T2 UltraSmart controller is included. With the supplied outdoor sensor, it adjusts output and water temperature to the weather, shuts heating off in warm weather and offers a Boost mode. Two operating modes are available: standalone electric, the default setting, or automatic transfer controlled by an external contact.

The unit is 56 7/16 in high and 22 in in diameter, and 25 1/2 in deep with the door. It weighs 280 lb, plus the water in the tank once filled: we choose a location with you in the basement or mechanical room, on a floor that can carry that weight.

What AirGreen’s installation covers

Everything starts with a free on-site estimate. We look at the main source, the hot-water loop (radiant floor, baseboards or radiators), the electrical panel and the available space. You then receive a written quote. It lists the circulator and expansion tank to plan for, since they are not among the parts Thermo 2000 supplies. The manufacturer recommends a #30 tank for a radiant floor or baseboards, and a #60 for cast-iron radiators.

On installation day, our technicians set the unit in place and connect it to the loop through its 1 in NPT fittings. They install the supplied 30 psi relief valve, automatic air vent and outdoor sensor, then make the electrical connection. We fill and purge the system, set the controller and check operation with you.

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. For its part, Thermo 2000 covers the tank for 15 years in residential use and the electrical and mechanical components for 2 years.

Plan your electric backup

We install the AltSource in Montreal, Laval, Longueuil, on the North Shore and on the South Shore. Ask for your free estimate: you receive a clear written quote, and financing is available so you can go ahead without waiting.