The Smarter Way to Heat Water at Home
Whether you're building a new home or replacing an aging unit, rising energy costs, unpredictable hot water supply, and environmental concerns are all valid reasons to reconsider how you heat water. Propane tankless water heaters address every one of these challenges — delivering endless hot water with compact, high-efficiency technology that conventional electric and heating oil systems simply cannot match.
Why Propane Tankless Water Heaters Win
Here's what sets propane tankless units apart from every other water heating option.
Reduced Energy Costs
Propane tankless units can cut energy costs by up to 50%, eliminating standby heat loss and the constant expense of keeping a full tank warm around the clock.
Lower Annual Ownership Cost
Propane tankless heaters offer the lowest annual cost of ownership in four out of five U.S. climate zones, outperforming competing models in real-world testing.
No More Cold Showers
Enjoy a virtually unlimited supply of hot water — propane tankless models average around 222 gallons per hour, compared to just 62 GPH for standard electric storage tank units.
Space-Saving Design
A propane tankless unit can reclaim up to 16 square feet of floor space compared to a conventional storage tank model — ideal for tight utility rooms or modern open layouts.
Long Service Life
Propane tankless water heaters are built to last approximately 20 years — significantly longer than most conventional storage heaters — making them a smart long-term investment.
Hot Water Flow Rates: Propane Tankless vs. The Competition
When comparing first-hour delivery for storage units and gallons-per-minute for tankless, propane comes out well ahead of both electric storage tanks and heat pump water heaters.
Smarter Installs, Better Results
Installing a propane tankless water heater is more straightforward than most expect. These units are less labor-intensive than traditional tank-style models, and they work with the same plumbing infrastructure as natural gas water heaters.
That said, experienced installers understand there's real craft in getting it right. With proper planning and technique, professionals can minimize upfront installation costs, maximize long-term performance, and ensure the unit delivers its full 20-year lifespan.
The sections that follow cover everything from venting strategies to whole-home system design — giving you the expertise to deliver a flawless installation every time.
5 Things to Know Before You Install
Size Your Unit to Demand
Calculate your peak simultaneous hot water demand — showers, dishwashers, washing machines — before selecting a unit. Undersizing is the most common mistake in tankless installations.
Plan Your Venting Strategy Early
Propane tankless heaters require proper venting for safe and efficient operation. Choose between direct-vent and power-vent configurations based on your installation location before work begins.
Account for Cold Groundwater
In colder climates, incoming groundwater temperature significantly affects output. Factor this into your BTU and GPM calculations to ensure consistent hot water delivery year-round.
Optimize the Gas Supply Line
Tankless heaters require a higher BTU input than conventional storage models. Ensure your gas supply line and regulator are properly sized to support the unit at full demand.
Schedule Regular Maintenance
Annual descaling and inspection preserve efficiency and extend lifespan. Hard water areas may require more frequent servicing to protect the heat exchanger.
Performance Numbers That Speak for Themselves
Propane tankless technology isn't just cleaner and more efficient — the real-world performance gap between propane and other fuel sources is dramatic. These are the numbers that close the conversation.
Start With a Unit Built for the Job
The Eccotemp Builder Grade outdoor propane tankless water heater is engineered for reliability, efficiency, and easy installation — everything this guide covers, in one ready-to-install package.