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Tankless water heaters are highly efficient and provide hot water instantaneously without the need for a hot water storage tank. Aire One KW offers the industry's most advanced condensing tankless heaters, strong enough to support enough hot water for any size home. 

Switch to a tankless water heater for a more eco-friendly solution that can reduce your energy consumption by 20% and significantly reduce greenhouse gas emissions. Give Aire One KW a call today to help you make the change.


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High-efficiency tankless water heaters provide you with an endless supply of hot water. As soon as it detects water flow the flow senor is activated and the hot water process begins. Water is pre-heated in the secondary heat exchanger and then passes through the primary heat exchanger. From there, the water is heated to the desired temperature, flows through the pipes in your home and to the faucet you just turned on. 




Condensing Tankless Water Heaters provide unlimited hot water to your home. Operationally they are are ultra high-efficient and reduce your energy consumption and costs. 

  • How often should I service my boiler?
    A minimum of once a year is recommended. Heating systems come on an average of 3-8 times per hour during the heating season, these numbers can change dramatically in different style of homes and with different thermostats, but this is a rule of thumb in our industry. There is a lot of wear and tear on the appliance and setting can go out of calibration. Also, it is a requirement by most manufacturers and home insurance companies.
  • Can I add new zones to my existing boiler heating system?
    It depends if the btu output of the radiators has reached the maximum btu output the boiler can support. Having a professional to come out and calculate is your best bet.
  • How will I know if the boiler I select will work properly for my home?
    Each room will have a radiator and every radiator has a specific btu output . We calculate the total of the radiator btu outputs, match that with a heat loss/heat gain calculation for the home and that is how we size a boiler system for your home.
  • How does a boiler work to heat my home?
    A boiler is a device that heats water and then distributes the hot water throughout your home to warm the indoor air. There are two main types of boilers: hot water boilers and steam boilers. Hot water boilers heat water to a temperature of about 82 C. The hot water is then circulated through a system of pipes and radiators throughout the home. The radiators give off heat to the surrounding air, which warms the home. Steam boilers heat water to a temperature of about 100 C, which is the boiling point of water. The steam is then distributed through a system of pipes and radiators throughout the home. The steam condenses back to water on the radiators, which gives off heat to the surrounding air, warming the home. In both hot water and steam boilers, the water in the pipes cools and returns to the boiler after heating the interior spaces. The water is then reheated and recirculated throughout the home. Some boiler models also double as a water heater, eliminating the need for a separate water heater unit. The efficiency of a boiler is measured by its Annual Fuel Utilization Efficiency (AFUE) rating. The AFUE rating is a percentage of the fuel that’s used to heat the water that heats the home. The higher the AFUE rating, the more efficient the boiler. Boilers with medium levels of efficiency have ratings of 90 to 93 per cent.
  • What is the average lifespan of a residential boiler?
    The typical residential boiler can last between 15 and 20 years. You can find the year your boiler was manufactured by checking the unit’s rating plate. You can also call the manufacturer and give them the unit’s serial number to find out how old your boiler is. If your boiler unit is more than 15 years old, you should consider replacing it with a new boiler, high-efficiency gas furnace or heat pump.
  • Are there any government rebates available for my boiler upgrade?
    Unfortunately, Ontario homeowners in the Tri-Cities area wanting to invest in a new boiler system for their homes aren’t eligible for rebates under the Home Efficiency Rebate Plus (HER+) program. Heat pumps are the only home heating system covered under HER+, whereby homeowners can get more than $10,000 in rebates on a heat pump installation. This program combines the Enbridge Gas rebate program and the Canada Greener Homes Grant.



Condensing tankless water heaters have ultra high-efficient operation. This allows for long-term operating costs to be lower than typical non-condensing tankless and storage tank system which helps keep your utility bills low. 



Since there is no storage tank to sit on the ground and hold water, tankless water heaters can be installed on the wall in your utility room. Give us a call today to learn more about installations and service of tankless water heaters in Waterloo, Cambridge, Guelph and surrounding areas.  We carry a wide variety of tankless water heaters from trusted brands like Navien, Rheem and Bosch. 


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Tankless water heaters provide clean water delivery throughout your home. There is no need for you to worry about rust developing unlike tank models. 


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Professional, Respectful, Knowledgeable, and Helpful

This was my first time using Aire One Heating & Cooling KW and they completely exceeded my expectations. Troy, the service tech, was punctual and was extremely professional, respectful, knowledgeable and helpful. I had noticed a huge spike in my gas bill for the prior month and Troy was able to come out the next day, check all of our gas appliances, determine the cause of the issue, explain the issue to me in layman's terms and fix the issue all within the same day. Thank you Troy for everything, I am very grateful that you were able help keep my family safe and put my mind at ease!

~ Robyn K.


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