The 5 Series

Smarter from the Ground Up™

The 5 Series® 500A11 carries some of our best features and efficiencies. Its advanced components offer a level of comfort and savings that’s far greater than any ordinary system and represents the industry’s highest efficiency two-stage unit at 28 EER and 4.8 COP.

All 5 Series units are ENERGY STAR® rated and were engineered in the HVAC industry’s only in-house ENERGY STAR Recognized Laboratory. It provides forced air heating, air conditioning, and even generates a portion of your home’s hot water—all from a single unit. Replace your fossil fuel furnace and noisy outdoor air conditioner with a system that uses the earth as its fuel source.

Geothermal heat pumps are not only the most comfortable way to heat and cool, they’re also the most cost effective. They’re versatile enough to excel in almost any home or any environment, and you’ll find geothermal in more than 1 million households across Canada and all 50 U.S. states. They can be scaled for single-family homes to entire college campuses. In fact, we heat and cool our entire 110,000 square-foot headquarters with WaterFurnace equipment. Here are a few reasons why geothermal is one of the fastest growing technologies available for your home.

Energy Efficient

The best ordinary systems deliver less than one unit of energy for every unit they consume. But many WaterFurnace systems can deliver five or more units of energy for every one unit of electrical energy used. That translates into an efficiency rating exceeding 530%, while the most efficient gas furnace which rates only 98%.


WaterFurnace units are designed to run more often at low speeds to provide stable temperatures throughout the home and help eliminate hot or cold spots. This is especially true with variable capacity units. They provide a comfort you need to experience to believe. To achieve precise control over temperatures in up to 6 areas, add our IntelliZone2 zoning system.

Cost Effective

Because of the extraordinary efficiency of a WaterFurnace system, most homeowners save more on monthly bills than they pay for the system when installation costs are added to the mortgage. Any added investment over traditional equipment is usually recovered in just a few years, and many homeowners see a return on investment of 10-20% over the life of the system.


WaterFurnace systems don’t require noisy outdoor units that can disturb your peaceful surroundings. And, we’ve engineered the indoor system to be as quiet as possible. Since it runs at lower speeds more consistently, the amount of noise coming from the unit is minimal.

Environmentally Friendly

Geothermal systems are recognized by the United States Environmental Protection Agency as the most environmentally friendly, cost effective and energy efficient heating and cooling technology available. These systems also minimize the threats of acid rain, air pollution, the greenhouse effect and global warming—problems directly linked to the burning of fossil fuels. In fact, installing a single geothermal unit is the environmental equivalent of planting 750 trees or removing two cars from the road.


Geothermal units aren’t subjected to the punishing effects of outdoor weather or fuel combustion, so they last longer than nearly any other heating and cooling system. According to the American Society of Heating, Refrigerating, and Air Conditioning Engineers, geothermal units have an average equipment life of 25 years while the underground loop system has a rated material life of more than 100 years. Ordinary air conditioners, furnaces and heat pumps are rated for only 12-18 years.

Clean Air

WaterFurnace units circulate air more often, which naturally filters the air. Many units also come standard with large, high efficiency MERV 11 filters to provide exceptional indoor air quality and protect your family from dust and pollen.


Package systems are available that provide heating, central air conditioning, and supplemental domestic hot water for your entire home in an all-in-one unit. For homeowners with less utility space, WaterFurnace also offers split units. Horizontal, vertical and bottomflow configurations are available for a wide range of residential applications, including newly constructed as well as existing homes


Because natural gas, propane, or oil isn’t required to operate a WaterFurnace system, there’s no combustion flames or fumes, and no chance of carbon monoxide poisoning.

Using the earth to heat & cool

A geothermal heat pump (GHP) taps into the renewable solar energy stored in the ground to provide savings up to 70% on bills. Using a series of underground pipes, it exchanges heat with the earth instead of outdoor air. While air temperatures can vary greatly from day to night or winter to summer, the temperature just a few feet below the earth’s surface stays an average 55°-70°F year-round.

Summer cooling

As outdoor temperatures rise, a GHP collects the unwanted heat in your home and moves it to the cooler 55° earth. Meanwhile, ordinary heat pumps and air conditioners are forced to dump that heat outside. Unfortunately, hot summer air is already saturated with heat and is less willing to accept more. That makes ordinary cooling systems least efficient when you need them to be the most efficient.

Winter heating

As outdoor temperatures fall, a GHP draws from an underground reservoir of heat, concentrates it, and moves it to your home. Meanwhile, an ordinary heat pump is forced to collect heat from frigid winter air, making it least efficient when you need it to be the most efficient. And unlike a furnace, our units don’t create heat through combustion. They simply collect and move it.

Traditional Air Conditioner

Summer air is already saturated with heat and is less willing to accept more. Thanks to the constant temperature of the earth, geothermal is more than twice as efficient at cooling than any ordinary heat pump or air conditioner.