Tankless Water Heaters in St. Catharines

Tankless water heaters heat water on demand rather than storing a tank of hot water that loses heat continuously, making them significantly more energy-efficient for St. Catharines households with moderate to high hot water usage. A properly sized and installed tankless unit delivers endless hot water at the correct temperature regardless of simultaneous demand points, provided the flow rate and gas or electrical supply are correctly matched to the unit. Birnie Plumbing and Drains sizes, supplies, and installs tankless water heaters with the venting, gas line, and electrical modifications the system requires.

01

Assess Hot Water Demand

We calculate your peak hot water demand based on fixture count, household size, and usage patterns to confirm the correct unit flow rate and BTU rating.

02

Select the Right Unit

We recommend a unit based on your fuel type, flow rate requirement, and installation location, with clear explanation of operating cost vs. upfront cost trade-offs.

03

Prepare the Installation Site

Gas line sizing, venting configuration, and condensate drain routing are assessed and any required modifications are completed before the unit arrives.

04

Install and Connect

The unit is mounted, gas or electrical connections completed, venting installed, and isolation valves fitted for future maintenance access.

05

Commission and Test

Flow rate, temperature, and simultaneous demand are tested before sign-off. We walk you through the unit controls and maintenance schedule.

Endless Hot Water on Demand

A correctly sized tankless unit delivers continuous hot water at a consistent temperature regardless of how many fixtures are running simultaneously.

Significant Energy Cost Reduction

Eliminating standby heat loss reduces water heating energy consumption by 20 to 40 percent for most households, producing real savings on every utility bill.

Correct Sizing Is Everything

An undersized tankless unit cannot meet peak demand. We calculate your actual peak flow rate before recommending a model, so it performs as expected every time.

Space-Saving Wall-Mount Installation

Tankless units mount on the wall and take a fraction of the floor space of a traditional tank, freeing up mechanical room space for other uses.

Long Service Life

Tankless water heaters have a design life of 20 or more years when properly maintained, significantly longer than conventional tank units.

Gas Line and Venting Modifications Included

Where the existing gas line or venting is not sized for the new unit, we complete all required modifications as part of the installation scope.

Workmanship Guaranteed

All tankless water heater installations are covered by our full workmanship guarantee on labour and installation.

100+ Years of Trusted Service

Birnie has been installing water heating systems across the Golden Horseshoe since 1922. Our advice on tankless is based on experience, not a sales script.

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Existing tank water heater is due for replacement

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Household regularly runs out of hot water during peak demand

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High gas or electricity bills attributable to water heating costs

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Endless hot water is required for a large household or multiple simultaneous users

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Space constraints in the mechanical room would benefit from a wall-mounted unit

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Existing unit is in a garage or unheated space where freeze protection is a concern

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Hot water delivery to remote fixtures takes too long with the existing tank location

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A renovation is planned that would require relocating or resizing the water heating system

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Interest in reducing long-term operating costs through on-demand heating technology

Local St. Catharines Expertise

We understand the specific infrastructure, soil conditions, and pipe age patterns of St. Catharines properties, knowledge that makes diagnosis faster and more accurate.

Camera-First Diagnostics

We don't guess. Camera inspection of drain and sewer systems before recommending repair ensures you pay for the right solution, not the one that seemed most likely.

Options Before Action

You'll never receive a single take-it-or-leave-it quote from Birnie. We present all viable options with clear explanations so you can make an informed decision.

Certified & Insured

All Birnie technicians are certified plumbers operating under full liability insurance and WSIB coverage. Your property and our team are protected on every job.

Workmanship Guarantee

We stand behind our work. All Birnie repairs and installations carry a workmanship guarantee, we fix it right or we come back at no charge.

24/7 Emergency Response

Plumbing emergencies don't follow business hours. Birnie Plumbing & Drains is available around the clock for St. Catharines emergency service calls.

Upgrade your St. Catharines home to endless hot water with a tankless (on-demand) water heater. Never run out of hot water during back-to-back showers again, and reduce water heating costs by 20–30% compared to a tank unit. Birnie Plumbing & Drains installs and services all major tankless brands — Navien, Rinnai, Noritz, and others — throughout St. Catharines, with proper sizing, gas line assessment, and venting included.

Call 905-684-8833 for same-day service, or request service online.