THERMO 2000 ComboMax Ultra 70 Electric Boiler with Integrated Hot Water | 4.5 kW - 240V

Light heating and plenty of hot water: the 4.5 kW ComboMax Ultra 70

Designed for homes that use a lot of hot water

In the morning, in a family, showers follow one another while the dishwasher finishes its cycle. That is the kind of home where Thermo 2000’s COMBOU70-4,5 stands out. It pairs a single 4.5 kW heating element with the large tank of the ComboMax Ultra series, which holds 71 US gal of heating water. According to the manufacturer, it delivers 73 US gal of hot water in 10 minutes and 95 US gal in one hour, for water delivered at 110 °F, cold water at 40 °F and boiler water at 180 °F.

Drinking water, for its part, is never stored hot. It flows through parallel copper coils immersed in the heating water and heats up on the way. Thermo 2000 states that it arrives hot in under 7 seconds and that this design reduces the risk of Legionella.

On the heating side: 4.5 kW for a home that needs little

The unit delivers 15,354 BTU/h at 240 V, on a single stage. It is a size for a recent or renovated, well-insulated home, or for a specific zone such as a basement heated by radiant floors. The T2 UltraSmart controller runs the heating pump when the thermostat calls and gives priority to domestic hot water when it is being drawn.

The electrical panel is lightly loaded: Thermo 2000 specifies a 30 A breaker and Cu 10 or Al 10 wire at 240 V. At 208 V, output is multiplied by 0.75 according to the manufacturer, which we check before recommending this size.

Taller than the 50: measure before choosing

The large tank needs more room: 70 1/2 in high, 24 in in diameter and 430 lb empty. In a basement in Montreal or Laval crossed by beams and ducts, the clearance matters, and we measure it during the visit. Heating connections are 1 1/4 in male NPT, domestic water connections 3/4 in female NPT.

AirGreen’s installation, from estimate to start-up

The free estimate is done on site, in Longueuil, on the South Shore, the North Shore and throughout Greater Montreal. We assess your hot water needs, the heating load, the panel and the location, then give you a written quote. On installation, the unit is set in place and connected by qualified personnel to the heating loop and to domestic water. The pressure regulator with check valve, the thermostatic mixing valve, the air vent and the temperature and pressure gauge are already factory-mounted, which shortens the work on site. We finish with filling, purging, setting the controller and a hot water test at a tap.

A family business established in Montreal for more than fifteen years, AirGreen holds RBQ licence 5645-9605-01 (ventilation, refrigeration and electrical). Thermo 2000 covers the tank and coils for 15 years in residential use (10 years in commercial use) and electrical and mechanical components for 2 years.

Ask for your free estimate: written quote and financing available for your ComboMax Ultra 70.