LICENSED WATER HEATER EXPERTS
Tankless Water Heater Installation in Southern Ontario
High-efficiency tankless water heaters for reliable hot water — installed by local pros.
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Energy Efficient Water Heating
Lower energy use with high-efficiency tankless technology.

Endless Hot Water
Enjoy hot water whenever you need it, without running out.

Own It Outright
No rentals. No monthly fees. Just reliable hot water.

Rebate Support
We help you get the rebates you deserve.

Professional Installation
Expert installation for safe, reliable, long-lasting performance.

Rebate Support
We help you find and claim the rebates you may qualify for.

Lower Energy Bills
Save more with an efficient tankless water heating system.

Upgrade to a Tankless Water Heater
Get reliable hot water and greater energy efficiency for your home.
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A. O. Smith Tankless Water Heaters with X3™ Technology
Continuous Hot Water. Less Maintenance.
Upgrade your home with the A. O. Smith Adapt®+ tankless water heater, professionally installed by 1st Heat Home Comfort Inc.
Patented X3™ Scale Prevention Technology helps prevent scale buildup, protecting performance and eliminating the need for annual descaling.
A. O. Smith Tankless Water Heaters Benefits
- *Continuous hot water on demand
- X3™ scale prevention—no annual descaling required
- Built-in recirculation pump for compatible plumbing setups
- ENERGY STAR® certified with a 0.95 UEF efficiency rating
- Compact, wall-mounted design
- Natural gas operation, convertible to propane
- 15-year limited heat-exchanger warranty and 5-year limited parts warranty for residential applications
A. O. Smith Tankless Water Heaters models
- ATHR-160X3
- ATHR-180X3
- ATHR-199X3.
We’ll help you choose the right size for your household’s hot-water needs.
Call 289-409-9929 for a free installation quote.
Hot-water capacity depends on incoming water temperature and demand. Recirculation may require additional plumbing or accessories. Manufacturer’s warranty terms apply. Other routine maintenance is still required.
Choose the Right Rinnai Tankless Water Heater for Your Home
Continuous Hot Water. Efficient Performance. More Space.
Upgrade your home’s hot-water system with a Rinnai SENSEI® RX Series tankless water heater, professionally installed by 1st Heat Home Comfort Inc.
Rinnai tankless water heaters heat water as it flows through the unit, delivering continuous hot water without storing it in a large tank. Their compact, wall-mounted design frees up floor space, while condensing technology helps reduce energy waste.
Rinnai RX160iN — For Moderate Hot-Water Demand
The RX160iN offers efficient, on-demand water heating for households with moderate simultaneous hot-water needs.
- Maximum heating input: 160,000 BTU/h
- Efficiency rating: 0.97 UEF
- Maximum rated flow: 9.0 US gallons per minute
- ENERGY STAR® certified
- Compatible with natural gas or propane
This model may be a good fit when fewer showers and hot-water appliances operate at the same time. We assess your household’s usage and incoming water temperature to confirm the right size.
Rinnai RX199iN — More Capacity for Higher Demand
The RX199iN provides greater heating capacity for households that need more hot water at once.
- Maximum heating input: 199,000 BTU/h
- Efficiency rating: 0.98 UEF
- Maximum rated flow: 11.1 US gallons per minute
- ENERGY STAR® certified
- Compatible with natural gas or propane
Its higher heating capacity allows it to deliver more hot water than the RX160iN under the same conditions, making it an option for homes with greater simultaneous demand.
Which Model Is Right for Your Home?
The best choice depends on more than the number of bathrooms. We consider shower flow rates, appliances used at the same time, incoming water temperature, and your home’s gas supply and venting.
Ontario’s colder winter water temperatures reduce the amount of hot water a tankless unit can produce per minute. The maximum flow ratings above are not guaranteed winter delivery rates. Proper sizing helps ensure your system meets your everyday needs.
Does Tankless Mean Instant Hot Water?
Tankless provides continuous hot water within the unit’s capacity, but water still needs time to travel through your pipes to the tap. A compatible recirculation system can help reduce this wait. Ask us about options and any additional equipment your home may require.
Maintenance and Warranty
Regular maintenance helps protect performance and equipment life. Rinnai recommends annual flushing to remove mineral buildup, along with periodic filter checks. Maintenance needs can vary with water quality and usage.
Manufacturer’s limited warranty coverage is subject to the selected model’s terms, installation requirements and application. We can explain the applicable coverage before installation.
Professional Installation by 1st Heat Home Comfort Inc.
We help you select the right model and assess the gas supply, venting, water connections and condensate drainage needed for your installation.
Our own team completes your installation—no subcontractors.
Serving homeowners across Toronto and the Greater Toronto Area.
Call 289-409-9929 for a free installation quote.
Our Recommended Products

Rinnai SENSEI RX160 Tankless Water Heater
- Fuel Type: Natural Gas / Propane
- Maximum Gas Input: 160,000 BTU/h
- Minimum Gas Input: 15,000 BTU/h
- Maximum Flow Rate: Up to 9.0 GPM (34 L/min)
- Minimum Flow Rate: 0.13 GPM (0.5 L/min)
- Dimensions (W × H × D): 18.5 × 30.1 × 11.4 in
- Weight: Approximately 54 lb (24 kg)
- Sound Level: 48 dB
- Water Supply Pressure: 15–150 PSI
Best for: medium-sized homes and moderate to high hot water demand

Rinnai SENSEI RX199 Tankless Water Heater
- Fuel Type: Natural Gas / Propane
- Maximum Gas Input: 199,000 BTU/h
- Minimum Gas Input: 15,000 BTU/h
- Maximum Flow Rate: Up to 11.1 GPM (42 L/min)
- Minimum Flow Rate: 0.13 GPM (0.5 L/min)
- Dimensions (W × H × D): 18.5 × 30.1 × 11.4 in
- Weight: Approximately 55 lb (24.5 kg)
- Sound Level: 49 dB
- Water Supply Pressure: 15–150 PSI
Best for: large homes and high hot water demand with multiple simultaneous users.
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Our Last Tankless Water Heater Installation
Watch real tankless water heater installation projects completed by our experts across Southern Ontario.
TANKLESS WATER HEATER Services Southern Ontario You Can Depend On

Tankless Water Heater Installation
Professional installation of tankless water heaters that ensure proper sizing, safe connections, and reliable hot water performance year-round.

Tankless Water Heater Repair
Fast diagnosis and repair services that restore hot water quickly, addressing ignition issues, flow problems, and system errors.

Tankless Water Heater Maintenance
Preventive maintenance services that improve efficiency, reduce scale buildup, and extend the lifespan of your tankless system.
How Much Hot Water Does Your Home Need?
Choosing the right tankless water heater depends on how many hot-water fixtures may operate at the same time—not only the number of bathrooms in your home.
Every shower, faucet and appliance requires a certain amount of water, measured in GPM (gallons per minute).
Typical Hot-Water Flow Rates
| Fixture or appliance | Typical flow rate |
|---|---|
| Bathroom faucet | 0.5–1.5 GPM |
| Kitchen faucet | 1.5–2.2 GPM |
| Standard shower | 1.8–2.5 GPM |
| Rain or luxury shower | 2.5–4.0+ GPM |
| Dishwasher | 1.0–2.0 GPM |
| Washing machine | 1.5–3.0 GPM |
| Bathtub filler | 4.0–7.0+ GPM |
Actual water usage depends on the fixture, water pressure and whether hot and cold water are being mixed.
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Why Proper Sizing Matters in Southern Ontario
A tankless water heater’s available GPM changes with the incoming water temperature. During an Ontario winter, the incoming groundwater can be much colder. The unit must work harder to raise that water to a comfortable shower temperature, reducing its available hot-water flow.
For this reason, a model advertised at a high maximum GPM may deliver less hot water during the coldest months. Your system should be selected according to its winter-temperature performance, not only its advertised maximum rating.
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The Importance of Regular Tankless Water Heater Maintenance
Regular maintenance ensures your tankless water heater delivers instant hot water without temperature fluctuations or pressure drops during daily use.
Servicing helps prevent mineral buildup and internal blockages, allowing your system to respond quickly and maintain consistent hot water flow.
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Every review reflects our commitment to quality workmanship, honest service, and lasting customer relationships. We take pride in helping homeowners enjoy reliable comfort with expert HVAC solutions they can trust.
Excellent rating
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Trustindex verifies that the original source of the review is Google.
I cannot recommend this company based on my experience. I needed to replace the central air conditioner at my rental property after my existing unit failed. Because I couldn't wait several weeks for another supplier, I chose this company because they had a unit in stock and could install it the next day. Before the installation, I specifically asked the owner not to discuss the job with my tenants. Despite that request, he asked both of my tenants to leave him 5-star reviews before the installation was even complete and also asked one of them for my husband's phone number, even though I am not married. After the installation, I received a call telling me to come to the property immediately because the furnace was no longer working. When I arrived, I was told the furnace couldn't be repaired and was immediately offered a replacement furnace. When I asked them to repair the problem, they refused, so I hired another HVAC company. After waiting nearly two weeks for the required part, that company repaired the furnace. I refused to pay until the furnace was repaired and the new air conditioner could actually be tested. Although the owner agreed, I received repeated messages demanding payment while we waited. Once the furnace was repaired and the air conditioner was finally running, I paid in full that same evening. It then took several days and multiple requests before I finally received my receipt. Within about a day of operation, the new air conditioner began making a loud noise that sounded like a tractor. I was instructed over the phone to bleed refrigerant from the system myself, which I refused because I do not have the proper equipment or training. I requested that someone other than the owner attend the service call. The technician who arrived released what appeared to be refrigerant from the system for an extended period while the unit was running and would not answer my questions. I was concerned enough that I considered contacting the fire department or environmental authorities. During a recorded phone call, the owner initially told me this was perfectly acceptable. In a later recorded conversation, he told me the technician should not have released the refrigerant but claimed his company was not responsible because the technician was a subcontractor. In another call later that same day, he changed his explanation again and said no refrigerant had actually been released. Receiving three different explanations about the same incident left me with very little confidence in the company's honesty or accountability. I then had another independent HVAC company inspect the air conditioner. They advised that it appears to be operating properly but could not guarantee the compressor hadn't been affected by the earlier overcharge and refrigerant release. Because I no longer have confidence in this company, I requested a refund of the labour warranty so I could use another contractor for future warranty work, or alternatively that they remove the unit and provide a full refund. Both requests were refused. I was then told that if I contacted the owner again, it would be considered harassment. Overall, the installation, communication, repeated pressure for payment, inconsistent explanations, refusal to accept responsibility, and handling of my concerns have left me extremely disappointed. I cannot recommend this company based on my experience.
Joanne BrearleyTrustindex verifies that the original source of the review is Google.
Alex installed our heat pump. Very organized person. Very happy with the outcome.
JIGNESH PATELTrustindex verifies that the original source of the review is Google.
Ac installed by Alex , highly recommended
Mohammad SoheiliTrustindex verifies that the original source of the review is Google.
Alex was very professional and knowledgeable about the complete job . I would highly recommend this company
Joe DePaolisTrustindex verifies that the original source of the review is Google.
Alex and his team did a good job, and I have no complaints about the quality of their work. They were efficient, and the system was installed properly. Fair pricing too.
Anish DsouzaTrustindex verifies that the original source of the review is Google.
Called Alex for no cool in toronto , they replaced my Air conditioner same day ,offering me fair price ,they were polite and efficient, 100% recommended
George NikolarosTrustindex verifies that the original source of the review is Google.
Alex installed my ductless heat pump all is excellent service was amazing!thank you so much.
Kelly ChadwickTrustindex verifies that the original source of the review is Google.
They instskked my ductless mini split heat oump air conditioner unit in kawartha lakes ontario, very happy with the install they went bynod to walk mevthrough everything 100% recomended.
vladimir zaceTrustindex verifies that the original source of the review is Google.
Alex installed my AC, Very great services!
Elias
Contact Us
Get in touch with us today for expert advice.
Our Office:
- 3300 Steeles Avenue West, Unit 11B-4 Concord, Ontario L4K 2Y4 Canada
- (289) 409-9929