
Never run out of hot water again. Tankless water heaters heat on demand, eliminate standby energy loss, and last twice as long as traditional tanks. We size, install, and commission your new unit — done right the first time.
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A homeowner in Port Credit was replacing an aging 50-gallon tank water heater that had been struggling to keep up with a busy household of five. Their two teenagers were regularly getting cold showers. We installed a Rinnai tankless unit on the same gas line with a modest upgrade to the gas supply. Hot water on demand, no tank to heat continuously, and noticeably lower gas bills. They haven't run out of hot water since. Tankless water heaters are one of the most popular upgrades we install across Mississauga, and it's easy to understand why. They heat water only when you need it, never run out, take up a fraction of the space of a traditional tank, and are significantly more energy-efficient over time.
Unlike traditional tank water heaters that continuously heat and store a volume of water, tankless units heat water on demand as it flows through the unit. Because there's no tank to maintain at temperature around the clock, you eliminate standby heat loss entirely.
That's typically where 15 to 20% of a traditional water heater's energy consumption goes — just keeping stored water hot when nobody is using it.

We install both types and can help you compare based on your home, usage, and budget.
One of the most trusted brands in the Canadian market. Excellent warranty coverage, strong technical support, and widely available parts. We recommend specific models based on your household size and usage patterns.
Known for their condensing technology and high efficiency ratings. Navien units are a strong choice for homes looking to maximize energy savings. We're fully trained on Navien installation and service.
More affordable upfront and straightforward to install. A solid choice for smaller households or homes where the budget for tankless isn't available right now. We install both and give you honest advice on which makes more sense for your situation.

We assess your gas line capacity, venting options, existing plumbing connections, and household hot water demand. We size the unit correctly and give you a firm quote before anything is ordered.
We recommend the right Rinnai or Navien model for your household, confirm availability, and schedule installation. Most standard installations are completed in six hours.
We handle gas line connections, venting, plumbing, and electrical connections to code. If a gas line upgrade is required, we factor that into the quote upfront — no surprises on installation day.
After installation, we run the system through a complete test cycle, confirm proper hot water delivery, set the temperature to the recommended 49°C, and walk you through the unit's controls and maintenance requirements. We also help you identify available rebates.
A tankless installation typically costs between $3,000 and $5,000 installed, depending on the unit and any required upgrades. We give you a firm quote after the initial assessment — no surprises on installation day.
We offer flexible financing through trusted lenders — including 0% interest for 12 months with approved credit. Spread the cost of your new system over time with monthly payment plans designed to fit any budget.
We assess your home, size the system correctly, and give you a firm quote before any work begins. No surprises on installation day.
An undersized unit can't keep up with peak demand. We calculate your household's flow rate requirements and recommend the right unit — not just the one we have in stock.
All installation work is backed by our labour warranty plus the manufacturer's equipment warranty — up to 10 years on heat exchangers with Rinnai and Navien.
TSSA licensed and STO certified technicians on every job. Gas line work, venting, and plumbing connections all performed to Ontario code.
As authorized contractors for leading HVAC manufacturers, we source and install only proven, high-efficiency equipment backed by manufacturer warranties.








Most standard installations are completed in six hours. If your home requires a gas line upgrade, new venting, or significant plumbing modifications, the job may take longer. We give you a clear timeline after the initial assessment.
Yes — as long as the unit is properly sized for your household's demand. A unit that's undersized for simultaneous use can struggle during peak demand. We size the system correctly for your home during the assessment.
Yes. By eliminating standby heat loss, tankless units typically use 15 to 25% less energy than a traditional tank water heater for the same household. The efficiency advantage is more pronounced for households that use moderate amounts of hot water.
Sizing is based on your household's peak flow rate demand and the incoming cold water temperature. We calculate this during the home assessment to ensure you get a unit that delivers consistent performance without being oversized.
Annual maintenance is recommended. The most important service for most Ontario homes is descaling — flushing the heat exchanger to remove mineral buildup. Hard water accelerates this buildup, and a clogged heat exchanger reduces performance and can trigger error codes.
Often yes, but not always. Tankless units have higher BTU output than tank water heaters, which sometimes requires a gas line upgrade to deliver adequate flow. We assess your existing setup during the consultation and factor any required upgrades into the quote upfront.
Tankless water heaters typically last 15 years or more with proper annual maintenance. This is roughly double the lifespan of a traditional tank water heater, which significantly offsets the higher upfront cost over time.
Contact Beyond HVAC today for tankless water heater installation in Mississauga. TSSA licensed, STO certified, and trusted by homeowners across the GTA.