If you’re shopping for a water heater and considering a tankless model you’re on the right track for long‑term savings. While the upfront cost of a tankless (on‑demand) unit is higher than a traditional tank, modern efficiencies and durability make it a strong investment—provided it’s properly sized, installed, and maintained.
Here, we explain the latest efficiency numbers and all-around benefits of buying a tankless water heater in 2025.
Tankless vs Tank: What’s New in 2025?
Efficiency Gains & Operating Costs
Recent studies show tankless models can be 24–34 % more energy efficient than traditional tanks for households using moderate amounts of hot water. For heavier usage, energy savings narrow but remain meaningful. Unlike a tank that keeps water hot continuously (leading to standby heat loss), tankless units heat water only when needed.
Lifespan & Durability
A well-maintained tankless unit can last 20+ years, far outpacing conventional tanks, which typically last 10–15 years. But this advantage depends on managing scale (especially in hard‑water areas). Annual or biannual descaling is now standard advice for preserving performance.
Space & Flexibility
Tankless units are compact and wall-mounted, freeing up floor space. They can often be installed near use points or in tighter mechanical rooms. However, in homes already relying on gas or electric tanks, upgrading can require electrical or plumbing changes.
Buy vs Rent: Short-Term Burden vs Long-Term Value
Renting Water Heaters
Many utility companies or rental firms offer water heater leasing, where you pay monthly and they handle maintenance. That sounds convenient, but costs can creep upward. ClimateCare Head Office notes that rental rates often increase year over year by around 3.5 %, which over time can exceed buying costs.
Rentals also limit your choice of model and efficiency level, and you don’t build equity. They may be easier for short‑term residents, but over 10+ years the fees tend to surpass the cost of purchase.
Buying Water Heaters
Owning your unit gives you control over technology, efficiency, and upgrade paths. The big cost is upfront, but after that, you only pay for energy, maintenance, and repairs. In many cases, a purchased unit pays for itself within 4–6 years when compared to rental fees.
In Ontario and parts of Canada, buying efficient models may also make you eligible for rebates and incentives.
What to Watch Out for with Tankless Systems
- Scale buildup: Hard water can coat the heat exchanger. Annual descaling is essential.
- Flow rate limits: Tankless models must be properly sized to deliver enough hot water to multiple fixtures concurrently.
- Upfront requirements: Some installations require upgrades to gas lines, venting, or electrical capacity.
- Sensor or ignition issues: If the system detects overheating or low flow, it can shut down or display error codes.
H2: Conclusion: Tankless + Buying = Best Long-Term Value (If You Stay Put)
For homeowners planning to stay in their home for 5–10+ years, buying a properly sized tankless system often makes better financial sense than renting a conventional tank. You gain higher efficiency, longer lifespan, and full control of your appliance. But it’s not a perfect solution for every house; home layout, hot water demand, and water quality all play roles in whether a tankless water heater is the right choice.
Install A Brand-New Tankless Water Heater Today
Considering buying a tankless water heater? Need help comparing models, sizing your system, or estimating your ROI? Our team at B&B ClimateCare can walk you through the numbers so you make the best choice for your home’s comfort and budget. Contact us today to get started!
