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Rinnai i-Series

Heat Only Condensing Boiler

The Rinnai i-Series heat-only boiler delivers ultra-efficient hydronic heating with up to 96.5% AFUE. Its modulating burner adjusts output continuously for even, comfortable warmth through radiant floors, baseboard radiators, or fan coils — using less gas than conventional boilers.

Rinnai i-Series Heat Only Boiler
Up to 96.5% AFUE
Modulating Burner
Stainless Steel Heat Exchanger
Radiant Floor Compatible

Overview

The Rinnai i-Series is a wall-mounted condensing boiler that delivers reliable, efficient hydronic heat. Its modulating burner ramps from 18,000 to 120,000 BTU/h, matching output to demand for maximum comfort and minimum gas consumption. Compact enough to mount in a closet, powerful enough to heat a large home.

Up to 96.5% AFUE — condensing technology extracts maximum heat from every cubic foot of gas
Modulating burner — adjusts continuously from 18,000 to 120,000 BTU/h for precise comfort
Compatible with radiant floors, baseboard radiators, fan coils, and multi-zone manifolds
Compact wall-mount design — frees up floor space vs. traditional boilers

Key Features

Condensing Efficiency
The stainless steel heat exchanger captures heat that conventional boilers waste — achieving up to 96.5% AFUE. Lower gas bills and reduced carbon footprint.
Modulating Comfort
Unlike on/off boilers that create temperature swings, the i-Series modulates from 15% to 100% output. Your home stays at a rock-steady temperature with no hot-cold cycling.
Multi-Zone Hydronic
Pair with zone valves or a multi-zone manifold to independently heat different areas of your home. Radiant floors upstairs, baseboard in the basement — one boiler handles it all.
Compact Wall-Mount
Mounts on the wall like a tankless water heater — freeing up valuable floor space. Direct-vent PVC exhaust means no chimney liner needed. Installation is simpler and less invasive than a traditional boiler.
Built for Canadian Winters
Hydronic heating is the gold standard for comfort in cold climates. Radiant warmth from the floor up, no forced air blowing dust, no cold spots. The i-Series is engineered to deliver this comfort efficiently.
10-Year Heat Exchanger Warranty
Rinnai backs the i-Series with a 10-year heat exchanger warranty and 5 years on parts when professionally installed. H&C handles all warranty registration for you.

Perfect If You're Looking To…

Replace an aging, oversized boiler with something compact and efficient. Add radiant floor heating to a new build or renovation. Upgrade from baseboard electric to hydronic warmth. Heat a multi-zone home with one quiet, wall-mounted unit.

Specifications

AFUE96.5%
BTU Input90,000 BTU/h
BTU Output86,850 BTU/h
Min Fire18,000 BTU/h
Turndown Ratio5:1
Venting2"/3" PVC
Gas TypeNG / LP
Voltage120V 60Hz
Sound Level47 dB(A)
Model NumberI090CN
Why Rinnai

Trusted Name in Hydronic Heating

Japanese Engineering

Rinnai has been engineering heating and hot water products since 1920. The i-Series condensing boiler combines over a century of expertise with modern modulating technology for maximum comfort and efficiency.

Professional Installation

H&C's licensed technicians are trained on Rinnai hydronic systems. Proper piping, venting, and water treatment are critical — we get it right so your system performs as rated.

Financing Available

Flexible payment options make the switch to heat pump technology affordable. Ask about our low monthly payment plans — combine with government rebates to reduce your out-of-pocket cost even further.

Not Sure Which Size
Is Right for Your Home?

Sizing a boiler correctly is critical — too small and your home won't reach temperature on the coldest days, too large and you waste gas. Our licensed technicians perform a free heat-loss calculation and recommend the right i-Series model for your home and distribution system.

Book a Free Home AssessmentCall 1-855-539-4328
FAQ

Frequently Asked Questions

What's the difference between a boiler and a furnace?
A furnace heats air and blows it through ducts. A boiler heats water and circulates it through radiators, baseboard, or radiant floor tubing. Hydronic (water-based) heating is generally more comfortable — radiant warmth from the floor up, no blowing air, no dust circulation, and very even temperatures throughout the home.
How much more efficient is a condensing boiler?
A condensing boiler like the i-Series achieves up to 96.5% AFUE — meaning 96.5 cents of every dollar of gas becomes heat. Older conventional boilers typically run 80–85% AFUE. That's 12–15% less gas for the same comfort, which adds up significantly over a Canadian winter.
What's the difference between heat-only and combi?
A heat-only boiler provides space heating only — you'll need a separate water heater for domestic hot water. A combi boiler does both: space heating and on-demand hot water in one unit. Choose heat-only if you already have a good water heater or need maximum heating capacity. Choose combi to consolidate into one appliance.
Can I use this with radiant floor heating?
Absolutely — the i-Series is ideal for radiant floor systems. Its modulating burner provides the low, steady water temperatures that radiant floors need. Combined with a mixing valve or zone manifold, it delivers luxurious radiant warmth throughout your home.
What maintenance does a boiler need?
Annual servicing is recommended — our technicians check water pressure, inspect the heat exchanger, verify ignition and safety controls, and flush the system if needed. Regular maintenance keeps the i-Series running at peak efficiency and extends its lifespan well beyond 15 years.
How long does installation take?
A straightforward boiler replacement (removing old unit, mounting new, connecting piping and venting) is typically completed in one day. New installations with radiant floor piping or multi-zone manifolds take 2–3 days. H&C handles everything: gas, water, electrical, and venting.
Customer Reviews

What GTA Homeowners Say
About Their Boiler

5.0on Google

"Fast Reliable Service, fixed my furnace at my business same day really appreciate it!"

FiFi Malik
Google Review

"H&C installed a furnace for both myself and my mother-in-law in 2019 and 2022. Very professional service and installation. Recently started experiencing an intermittent noise coming from the furnace 7 years later. I called Farshid, who sent Cameron over very promptly to check it out. He was very helpful and knowledgeable, and took the time to explain what was going on. Really appreciate the continued quality support years after installation. Highly recommend."

Tom Levac
Google Review

"Professional, timely and efficient service. I would highly recommend using this company. Exceeds expectation."

Minoo GM
Google Review

"I had the pleasure of working with H&C Heating and cooling over the weekend. His attention to detail along with the care he shows to clients and contractors is amazing. Hands down H&C Heating and cooling will be go too for anything HVAC related."

Terry Banfield
Google Review

"Most helpful, quick, kind and professional. Highly recommended! Many thanks!"

Marc Sourdillon
Google Review
View All Reviews on Google →

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Boiler Consultation

Tell us about your home and heating needs. We'll recommend the right Rinnai boiler and provide a clear, no-obligation estimate — including system design for your distribution type.

Free in-home heat-loss calculation
System design for your piping type
Response within 2 hours
Licensed & Rinnai-trained technicians
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