Boiler

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Boiler & Heating Solutions

Stress-Free Boiler Installation

From your first call to final start-up, 4Most Energy certified boiler experts handle everything

Site Inspection & Estimate

Our licensed technicians inspect your existing system, check gas line capacity, venting route, and zone layout, then prepare an accurate quote.

Professional Installation

We install the boiler, gas line, venting, hydronic piping, and all key components — expansion tank, pump, valves, pressure regulator, and sensors — built to Ontario code.

System Start-Up & Testing

System is filled, purged, pressure-tested, and fine-tuned. You receive a walkthrough, warranty registration, and full operation check before we leave.

Rinnai Boilers

Rinnai boilers deliver reliable heating and hot water with advanced condensing technology. Available in both heat-only and combi models, they adapt to natural gas or propane and save space — perfect for new builds or retrofits. With stainless steel heat exchangers, low-maintenance design, and widely available parts, Rinnai ensures efficiency and performance. Each system includes a 15-year heat exchanger warranty, 5-year parts warranty, plus 1-year labor coverage from 4Most Energy

Why Choose Rinnai Boiler with 4Most Energy?

Guaranteed best pricing on Rinnai boilers
Factory-trained technicians for expert installation
Extended maintenance plans from 4Most Energy

New NCB-H & NFC-H Series

Navien Boilers

High-Efficiency Wall-Hung NAVIEN Boiler
Navien is a global leader in high-efficiency condensing boilers, combi boilers, and water heaters, trusted in more than 30 countries. At 4Most Energy, we install, service, and maintain both Navien heat-only and combi systems. Designed for maximum efficiency, these boilers provide reliable home heating and endless hot water in one compact system. Every Navien comes with a 5-year parts warranty and a 15-year heat exchanger warranty, plus 4Most Energy adds a 1-year labor warranty for complete peace of mind.

Why Choose Navien with 4Most Energy?

Market innovator in high-efficiency combi & condensing boilers
Provides heating and hot water in one compact design
5-year parts + 15-year heat exchanger warranty
Extra 1-year labor warranty from 4Most Energy
Professional installation & maintenance by certified experts

Unlike many contractors, 4Most Energy includes it all

Devices & Materials Included in Boiler Installation

Complete installation package with all required components.

Isolation Valves

For easy maintenance without draining the full system.

Expansion Tank

Sized correctly for your boiler’s water volume and pressure

Auto Feeder & Pressure Regulator

Maintains consistent pressure with backflow prevention

System Circulator Pump

New high-efficiency pump with flange connections

Outdoor Sensor

Adjusts boiler temperature based on outdoor weather.

Hydronic Piping

Oxygen-barrier PEX, copper, or steel depending on your system layout.

Performance & Protection Upgrades for Your Boiler

Optional Add-On Devices & System Upgrades

Enhance your boiler’s efficiency, comfort, and reliability with professional upgrades by 4Most Energy.

Air Eliminator

Removes trapped air and oxygen bubbles to prevent corrosion.

Dirt & Magnetic Separator

Captures rust and metal particles in older radiator systems.

Low-Water Cut-Off

Protects the unit from overheating when water levels drop.

Zone Controller

Manages multiple heating zones for customized comfort.

Manifold with Zone Valves

Enables individual zone control and easy maintenance.

Low-Loss Header

Increases efficiency and flow balance for larger multi-zone systems.

Make Comfort Affordable With Easy Financing

⁠No Upfront Payment

Instant Approval

Flexible Monthly Plans

Talk to a Real Technician

kip the call centers connect directly with a certified HVAC pro for honest answers.

⁠Local Service You Can Count On

We’re proudly serving homes across the GTA fast response, trusted results.

Smarter Payment Options

Spread your cost with flexible monthly plans no surprises, just simple comfort.

⁠Share Comfort, Get Rewarded

Invite friends or family when they book with us, you’ll both benefit.