Hot Water
Tankless Water Heater Installation in Trenton & Quinte West
A tankless water heater delivers hot water on demand — no tank to maintain, no standby heat loss, and no running out mid-shower. Johnston Mechanical HVAC LTD installs Navien tankless water heaters across Trenton, Quinte West, Belleville, Brighton, and surrounding communities. Brandon personally oversees every installation as a TSSA certified gas technician (FS-R-52252).
A traditional tank water heater keeps 40 to 60 gallons of water hot around the clock, whether you need it or not. That standby heat loss adds up to 15 to 20 percent of your annual water heating costs. A tankless unit heats water only when you turn on the tap — eliminating standby loss entirely and delivering a continuous supply of hot water for as long as you need it.
Johnston Mechanical installs Navien condensing tankless water heaters. Navien is one of the leading brands in the Canadian market, with energy factor ratings up to 0.97 and a reputation for reliable performance in Ontario climates. Navien units are wall-mounted, compact, and significantly smaller than a traditional tank — freeing up mechanical room space for other equipment or storage.
Navien tankless units are also available in combi configurations that provide both space heating and domestic hot water from a single unit. This is a practical solution for smaller homes, cottages, or secondary suites in Trenton, Belleville, and Brighton where a separate boiler and water heater would take up too much space. Brandon will walk you through the options during the site visit.
Proper sizing is critical for tankless water heaters. The unit must be sized to meet your peak demand — the simultaneous hot water draw from showers, dishwashers, and laundry. An undersized unit will not keep up during peak use. Brandon calculates your household demand and recommends the correct model to ensure you never run short, even during a busy morning.
Gas line capacity is another factor that often gets overlooked. Tankless units draw significantly more gas than a traditional tank heater during operation. Brandon checks your existing gas line size and pressure during the site visit and identifies any upgrades needed before installation. Skipping this step is one of the most common causes of poor tankless performance after installation.
Tankless water heaters in Trenton and Quinte West typically last 20 years or more with basic annual maintenance — roughly twice the lifespan of a traditional tank. The investment pays back through energy savings and reduced replacement frequency over the life of the equipment.
What's Included
- Site visit and written quote
- Demand calculation and proper unit sizing
- Navien tankless water heater supply and installation
- Gas line connection and pressure test
- Venting installation (PVC or stainless)
- Cold water inlet and hot water outlet connections
- Condensate drain connection
- Full system commissioning and test
- 5-year labour warranty
- TSSA certification documentation
How a Job Goes
- 1
Site Assessment
Brandon visits your home in Trenton, Quinte West, Belleville, or Brighton to assess your existing water heater, gas line capacity, venting options, and available space for the new unit.
- 2
Written Quote
You receive a detailed written quote after the site visit. The quote covers the unit, venting, gas line work if needed, and labour. No ballpark estimates over the phone.
- 3
Installation
Brandon removes the old water heater, installs the Navien unit, connects gas, water, and venting, and runs the condensate drain. No subcontractors — Brandon does the work.
- 4
Commissioning
The unit is commissioned — gas pressure checked, flow rate confirmed, and temperature set to your preference. Brandon verifies there are no error codes and the unit is operating within spec.
- 5
Walkthrough
Brandon walks you through the unit controls, how to read the display, and what annual maintenance involves. Most Navien units require a descaling flush every one to two years depending on water hardness.
Service Area
Johnston Mechanical serves Trenton, Quinte West, Belleville, Brighton, Frankford, Stirling, and Campbellford for tankless water heater installation. We also serve surrounding communities in Hastings County and Prince Edward County. Call (613) 827-8973 to discuss your project.
Warranty
All tankless water heater installations by Johnston Mechanical include a 5-year labour warranty. Navien equipment carries its own manufacturer warranty on parts and heat exchanger. Brandon will walk you through coverage details at the time of installation.
Frequently Asked Questions
Will a tankless water heater run out of hot water?
No — a properly sized tankless unit delivers a continuous supply of hot water for as long as the tap is running. The key word is properly sized. Brandon calculates your peak demand before recommending a unit to ensure it can handle simultaneous draws from multiple fixtures without dropping temperature.
How much can I save on energy costs with a tankless water heater?
Most homeowners in Trenton and Quinte West see a 15 to 25 percent reduction in water heating costs after switching from a traditional tank to a Navien condensing tankless unit. The exact savings depend on your household size, hot water usage patterns, and the efficiency of the unit being replaced.
Does my gas line need to be upgraded for a tankless water heater?
It depends on your existing gas line size and the other appliances connected to it. Tankless units draw more gas during operation than a traditional tank heater. Brandon checks your gas line capacity during the site visit and will include any required upgrades in the written quote so there are no surprises.
Get a Written Quote — No Obligation
Pricing is provided after a site visit. No made-up numbers over the phone — just an honest assessment from a TSSA certified technician.