Water Heater Installation

Water Heater Installation in Ajax

Family-Owned. 20+ Years Serving Ajax. Over 7,000 Units Serviced.

At Marx Mechanical Heating and Cooling, we know how much a working water heater matters to your home or business. We’ve been serving Ajax and the Durham Region for over 20 years, handling water heater installation and replacement for both residential and commercial clients. Our team has serviced over 7,000 units, and we bring that experience to every job, from a straightforward tank swap to a first-time installation in a new build or home addition.

Ajax winters put real strain on water heating systems, and humid summers don’t let up much either. That seasonal demand is one reason we take sizing and system selection seriously rather than offering a one-size-fits-all recommendation. Replacement is the most common call we get, whether the unit has reached the end of its service life or failed unexpectedly. New installation is a different need and requires its own assessment of space, fuel source, and usage. Both tank and tankless systems are available, and the right choice depends on your household size, usage patterns, and available space. We’re available 24/7 when you need us and can guide you through every step of the decision. That’s the Marx Promise: balancing cost, efficiency, and reliability so we can recommend the right solution, not just a quick fix.

Ready to replace or upgrade your water heater? Call us at (289) 301-0414 or fill out our online form.

Seven Signs You Need Water Heater Replacement or Installation

Most water heaters fail gradually, not all at once. Knowing the warning signs gives you time to plan a replacement before you’re stuck without hot water. If your unit is showing any of the following, it’s worth getting a professional assessment.

Age of Your Water Heater: A unit at or beyond 10 to 15 years old is operating past its typical service life. Older heaters become less efficient and fail more often. Proactive replacement is often more cost-effective than waiting for a breakdown.
Inconsistent or Absent Hot Water: Frequently running out of hot water, or seeing temperatures swing unpredictably during a shower, means the unit is struggling to keep up with demand or failing to heat effectively.
Rust-Colored or Cloudy Water: Rust coming from the hot water tap signals internal corrosion. Cloudy water or visible sediment points to tank deterioration that won’t improve on its own and can lead to leaks.
Leaking Around the Base: Puddles or drips at the base of the unit can indicate cracked tank walls, loose connections, or a failing temperature and pressure relief valve. Any leak warrants immediate attention.
Rumbling, Popping, or Banging Sounds: These noises usually mean sediment has hardened at the bottom of the tank. Over time, that buildup reduces efficiency and damages the tank from the inside.
Unexplained Increase in Energy Bills: An aging water heater works harder to maintain temperature, and that extra effort shows up on your gas or electricity bill. If costs have risen without an obvious cause, the water heater may be a likely suspect.
Frequent Repairs: A repair here and there is normal. But if the same unit keeps failing, the cumulative cost of fixes often exceeds the price of a new installation. Replacement can become the more economical path.

If your unit is showing more than one of these signs, don’t wait for a complete failure. A new, energy-efficient model can provide more consistent hot water and may help reduce utility costs while offering greater day-to-day reliability than an aging unit.

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Getting Started in Simple

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Areas We serve

Providing service to Uxbridge, Ontario and other surrounding areas.

Ajax
Aurora
East Gwillimbury
Georgina
Kawartha Lakes
Newmarket
Oshawa
Pickering
Port Perry
Whitby
Whitchurch-Stouffville

Our Water Heater Installation Process in Ajax

A proper water heater installation isn’t just swapping out the old unit. It starts with evaluating your current setup, assessing your household or commercial hot water demand, and building a plan that accounts for your space, fuel source, and code requirements. We handle all necessary permits and inspections so you don’t have to manage that side of the project. The service covers both tankless water heater installation and traditional tank water heater replacement, and we work around your schedule throughout.

What a Standard Replacement Includes

A standard water heater replacement in Ajax typically covers: shutting down and draining the old unit, disconnecting the gas or electrical supply, removing and properly disposing of the old tank, preparing connections for the new unit, installing and securing the new heater, reconnecting utilities, testing operation, and confirming code compliance. We leave the space clean and confirm everything is running correctly before we go.

Upgrading From Tank to Tankless

Switching from a tank system to a tankless model often involves more than a direct swap. Gas line resizing, venting changes, or electrical upgrades may be required, and our licensed water heater installer team identifies those factors during the initial evaluation so there are no surprises on installation day. If cost is a concern, we offer flexible financing through Financeit so you can move forward with the right system without stretching your budget.

Permits, Compliance, & Local Considerations

Every water heater installation in Ontario must comply with the Ontario Building Code, which sets the requirements for safety, venting, connections, and permits. Our licensed team handles that compliance process on every job, so you aren’t left navigating permit requirements on your own. Ajax spans a mix of newer Durham Region subdivisions and older established neighborhoods, which means we regularly work across a wide range of housing ages and plumbing configurations. That variety is something our team is well-equipped to handle.

If you’re considering a heat pump water heater, Ontario’s Home Renovation Savings Program offers a $500 rebate for eligible ENERGY STAR-certified installations completed by a licensed contractor. Eligibility requirements apply, and the rebate does not extend to standard tank or tankless gas units. We recommend confirming current details at homerenovationsavings.ca before moving forward.

Ready to get started? Contact us at (289) 301-0414 or fill out our online form to schedule your installation.

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Make Marx Your First Choice Read Some of Our Five Star Reviews

View All Reviews

"The team at Marx Mechanical did an amazing job with my install."
They answered all of my questions, gave honest advice, and put in the extra effort to fit my new Daikin air handler into the very limited space that was available.

Dennis P.
"They have earned my trust!"
I received a quick reply from Marx and they were able to see me even faster than promised. In my conversations with the repair person, I felt that he knew his stuff and provided a lot of helpful information. I will continue to call on them when needed.

Dave M.
"Their staff and technicians were exemplary."
Marx Mechanical responded quickly when our furnace broke down on a cold day in December. They quoted a good price and installed the new equipment promptly. We were impressed with their professionalism and their promptness in dealing with the issue.

Robert A.
"Every step was smooth and competently handled."
We contracted Marx to replace our aging oil furnace with a high-efficiency heat pump. They arrived, promptly and prepared, on the agreed-upon installation date, protected walls and floors, worked diligently, and cleaned up afterward. Very professional!

Jabette B.
"My experience was outstanding!"
Each member of the team went out of their way to ensure I was well taken care of. In a world where everyone wants to cut costs by outsourcing and automating, Marx demonstrates the value of personal touch and putting the needs of their clients first.

Blake M.
"I would highly recommend Marx Mechanical!"
Marx Mechanical replaced our old furnace with a new heat pump which has kept our house warm all winter. They worked with us to find the perfect system for our home and our unique needs.

Serena E.
"I highly recommend this company!"
I had a new heat pump installation by Marx Mechanical. Thank you Jason, TJ & Tyler. Very professional company to work with. I couldn't be happier with the installation; it exceeds my expectations.

Susan C.
"Excellent HVAC company to work with!"
They took time to work with us to get the best furnace/heat pump to replace our 20-year-old furnace. They've checked in with us regularly, and while we haven't had any issues, we know that they would go above and beyond to fix anything!

Val R.

Frequently Asked Questions

How Long Does a Water Heater Installation Take in Ajax?

A standard water heater installation in Ajax typically takes 2 to 4 hours. More complex jobs, such as upgrading to a tankless system or making modifications to gas lines or venting, can take longer. We can walk you through the timeline upfront so you know what to expect before we start.

How Do I Choose the Right Size Water Heater?

For tank-style heaters, the key metric is the First Hour Rating (FHR), which measures how much hot water the unit delivers in the first hour starting from a full tank. Your FHR requirement depends on how many people are in your household and how much hot water you use simultaneously, including showers, laundry, and dishwashing. For tankless systems, sizing is based on the required flow rate in gallons per minute and the temperature rise needed across all fixtures running at once. A professional assessment takes the guesswork out of it and helps match you with a unit that meets your demand.

Is Professional Installation Required for a Water Heater?

Yes. Local code requires professional installation for both gas and electric water heaters. Improper installation can cause gas leaks, carbon monoxide exposure, electric shock, or water damage. A licensed installer helps make sure the unit is correctly sized, properly vented, safely connected, and fully code-compliant.

How Can I Extend the Lifespan of My Water Heater?

Annual maintenance makes a real difference. Flushing the tank, checking the pressure relief valve, and inspecting the anode rod are the core tasks that keep a unit running efficiently and can help catch problems before they become failures. Through our ongoing maintenance service, we keep your water heater in top condition and help you get the most out of its service life.

Contact Ajax’s Trusted Water Heater Installer

When it’s time for a new water heater, we bring honest advice and a personal touch to every job. As a family-owned business, we’re not here for a single transaction. We’re here to be a reliable partner for your home’s heating needs year after year. Call us or send a message online and we can help you find the right solution.

Get consistent hot water and improved efficiency with a properly installed system. Contact us at (289) 301-0414 or fill out our online form.

What Makes Us Different? Benefits of Working with Our Expert Team

Local Values - Exceptional Service
Being family-owned and operated means more than just business to us—it’s about building lasting relationships. We’re proud to serve our community with care, integrity, and quality you can trust.
Year-Round Comfort With Our Memberships
Our membership plans are designed to keep your systems running smoothly all year long. Enjoy exclusive perks like priority service, discounted repairs, and regular maintenance.
Team of Highly Experienced HVAC Technicians

With decades of industry experience, Marx Mechanical Heating and Cooling delivers expert HVAC solutions with precision, reliability, and quality service.
Transparent, Upfront Pricing

We are committed to honesty and transparency in all our services. We offer upfront pricing with no hidden fees - just clear, fair quotes from an HVAC company you can rely on.

Join the Marx Comfort Club
Year-round comfort is only a click away! Our membership plans offer priority service, discounted repairs, and more!

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