Rinnai Boiler Installation GTA – IP120S I-Series Plus Solo Boiler Guide
If you’re looking into Rinnai boiler installation GTA wide and found the Rinnai IP120S I-Series Plus Solo Boiler, you’re already on the right track. This is a modern, wall-hung, condensing boiler designed for high efficiency hydronic heating in the Greater Toronto Area.
This article is meant to support your product page: it explains what the IP120S actually is (and what it isn’t), where it works best, how a professional condensing boiler installation GTA project is done, and how it can be combined with a separate tankless installation Toronto or tankless water heater installation for a full mechanical upgrade.
1. What the Rinnai IP120S I-Series Plus Solo Boiler really is
The first thing to be clear about:
The Rinnai IP120S I-Series Plus is a solo, heat-only condensing gas boiler.
It is not a combi unit and does not produce domestic hot water by itself.
Domestic hot water is handled separately – usually by:
An indirect hot water tank connected to the boiler, or
A separate Rinnai tankless water heater installed alongside the boiler.
Key points for Rinnai boiler installation Greater Toronto Area projects:
Heat-only boiler (solo): Built purely for space heating loads – radiators, baseboard, in-floor heating, fan coils, or a combination.
High efficiency: As a condensing boiler with AFUE in the mid-90% range, it recovers more heat from the flue gases than older cast-iron boilers, reducing gas use.
120,000 BTU/h input: Suitable for many medium to larger GTA homes when matched to a proper heat loss calculation.
Wall-hung, compact design: Frees up floor space and allows a much cleaner, modern mechanical room.
Multiple zones and outdoor reset: The I-Series Plus platform supports multi-zone hydronic setups and outdoor reset curves, improving comfort and efficiency.
If your goal is hydronic heating Toronto / GTA with modern controls and better fuel economy, the IP120S gives you a strong base to build on.
2. When a Rinnai boiler installation GTA is the right upgrade
A Rinnai I-Series Plus boiler Toronto or GTA install usually makes sense when:
Your home already has hydronic heat, such as:
Cast-iron or panel radiators
Copper or aluminum baseboards
In-floor radiant heating loops
Hydronic air handlers or fan coils
Your existing boiler is:
15–20+ years old
Non-condensing, low efficiency
Oversized, noisy, or showing signs of failure
You want to:
Reduce gas bills with a condensing boiler installation GTA
Clean up a cluttered boiler room and gain floor space
Add or improve zoning (main floor / upper floor / basement / garage)
Prepare your system for a future tankless water heater installation or indirect tank
This kind of upgrade is especially common in:
Older Toronto and East York homes with radiators
Scarborough, North York, and Etobicoke houses that have baseboard loops
Markham, Richmond Hill, Vaughan, and Mississauga properties with in-floor heating in basements, additions, or garages
If your home is strictly forced-air (furnace + ductwork), a boiler is usually not the first upgrade; in that case, you’d more likely look at heat pumps or furnaces plus a tankless installation Toronto for hot water.
3. Rinnai boiler installation GTA – step-by-step
A proper Rinnai boiler installation GTA project should follow a clear, professional process.
Step 1 – System assessment and heat loss
Your installer should start with:
Visual inspection of the existing boiler, piping, valves, manifolds, circulators, and expansion tank
Evaluation of radiators, baseboards, or in-floor loops (condition, layout, sizing)
Check of venting, flue route, and gas line size and routing
A heat loss calculation for the home (not just “same size as the old boiler”)
The goal is to confirm whether the 120,000 BTU IP120S is correctly sized. Oversizing boilers is a common issue in older homes and can lead to short cycling and lower real-world efficiency.
Step 2 – Hydronic design, zoning, and DHW plan
Design decisions for Rinnai boiler installation Greater Toronto Area include:
Zoning strategy:
Example zones: main floor, upper floor, basement, garage, or in-law suite.
The I-Series Plus control platform helps manage multiple zones cleanly.
Venting and condensate:
Plan sidewall venting with proper clearances and max lengths.
Set up safe condensate drainage with neutralizer if required.
Domestic hot water concept:
Option A: Boiler + indirect hot water tank
Option B: Boiler + separate Rinnai tankless water heater installation
Option C: Keep your existing hot water solution for now, but design the room to allow a future tankless installation Toronto without major rework.
Step 3 – Removal and rough-in
On installation day, the crew will:
Shut down and isolate the old boiler
Drain parts of the system as needed
Remove the old boiler, venting, and any obsolete piping
Prepare the wall for the new wall-hung boiler bracket
Plan the new piping layout for supply, return, and zones
This is when the mechanical room starts to transition from “old boiler jungle” to a clean, organized Rinnai-based system.
Step 4 – Mounting, piping, and venting the IP120S
The new boiler is then:
Mounted securely on the wall bracket
Piped to the supply and return manifolds and circulator pumps
Connected to a properly sized gas line with isolation valves and sediment trap
Linked to a condensate drain with appropriate routing
Vent and intake pipes run to the outside with approved materials and terminations
Because the IP120S is a compact, direct-vent, condensing boiler, it can often be installed in places where older floor-standing boilers never could, or it can drastically open up a tight utility room.
Step 5 – Wiring, controls, and integration
Next, the installer will:
Wire thermostats, zone valves, and circulator pumps to the boiler controls
Configure outdoor reset curves so boiler water temperature adjusts based on outdoor conditions (more comfort, less fuel use)
Integrate any indirect tank controls or prepare the system for a future tankless water heater installation
Ensure that safety devices (low-water cut-off, pressure relief, etc.) are correctly installed and tested
Step 6 – Commissioning and verification
A professional Rinnai boiler installation GTA includes full commissioning:
Combustion analysis to confirm safe, efficient burner operation
System pressure and air removal checks
Verifying correct temperature differentials across each zone
Testing every thermostat and zone for proper response
Confirming venting, condensate, and safeties
Only after all checks are complete should the boiler be considered fully installed.
4. Pairing the boiler with tankless installation Toronto
Even though the Rinnai IP120S is strictly a heat-only boiler, many homeowners use the project as a chance to rethink their hot water system.
Options include:
Boiler + indirect tank
The boiler heats a coil inside a storage tank, giving you fast-recovery hot water and high efficiency.
Boiler + tankless water heater installation
Install a dedicated Rinnai tankless water heater for domestic hot water.
The boiler handles space heating; the tankless unit handles showers, taps, and fixtures.
This can be very attractive for families who want endless hot water and a compact mechanical room.
Staged upgrade:
Do the Rinnai boiler installation GTA now.
Size the gas line and plan vent routes so that adding a tankless installation Toronto later is simple and cost-effective.
This brand-aligned strategy keeps your controls, warranties, and service straightforward.
5. Benefits of Rinnai boiler installation GTA for homeowners
A properly designed and installed Rinnai boiler installation Greater Toronto Area offers long-term advantages:
Lower gas usage
Condensing technology and outdoor reset help the boiler run at lower water temperatures when possible, improving efficiency and reducing fuel consumption.
Better comfort with zoning
Multi-zone control lets you keep bedrooms cooler, living areas warmer, or treat the basement as a separate comfort zone.
Cleaner, quieter mechanical room
Wall-hung boilers free up floor space and reduce the “boiler room clutter” that many older homes suffer from.
Modern, modulating operation
Instead of full-blast on/off cycling, the boiler can modulate its output, which reduces noise, wear, and temperature swings.
Future-ready hot water
You can integrate an indirect tank or separate tankless water heater installation at any time, depending on your budget and priorities.
All of this makes a Rinnai I-Series Plus boiler Toronto / GTA upgrade one of the most effective ways to modernize an older hydronic heating system.
6. FAQs – Rinnai Boiler Installation GTA
Q1: Is the Rinnai IP120S a boiler or a water heater?
The Rinnai IP120S is a solo, heat-only condensing boiler. It is not a combi unit and does not directly produce domestic hot water. For hot water, you’ll use either an indirect tank or a separate tankless water heater installation.
Q2: How do I know if 120,000 BTU is the right size for my home?
You can’t rely on guesswork or the size of your old boiler. Your contractor should perform a proper heat loss calculation for the home and then match the boiler size to that load. In some homes, a smaller or larger model may be more appropriate.
Q3: How long does a typical Rinnai boiler installation GTA project take?
Most straightforward replacements can be done in about one working day. More complex retrofits—like major piping re-work, vent route changes, or a simultaneous tankless installation Toronto—can take a day and a half to two days.
Q4: Do I need new radiators or in-floor loops when I install a Rinnai boiler?
Usually not. Most existing hydronic emitters (radiators, baseboards, in-floor loops) can be reused, as long as they’re in good condition and reasonably matched to the heat loss. Your installer may recommend some balancing, valve upgrades, or small piping changes to optimize performance.
Q5: Are permits required for Rinnai boiler installation Greater Toronto Area projects?
Yes. Any work involving gas piping, venting, and electrical connections typically requires the correct gas and/or electrical permits, as well as inspections under Ontario code and TSSA regulations. A reputable contractor will handle permits and inspections for you.
When you’re ready to upgrade, a Rinnai boiler installation GTA using the IP120S I-Series Plus Solo Boiler gives you modern, efficient hydronic heating with a clear path to future tankless water heater installation or indirect hot water. It’s a powerful way to improve comfort, cut gas usage, and clean up the mechanical heart of your Greater Toronto home.
