In the YouTube video titled “Expert Plumber Compares Gas vs Electric TANKLESS Water Heaters,” Roger Wakefield explains the key differences between gas and electric tankless units, along with several real-world considerations you should keep in mind before making the switch. If you’re a homeowner looking to upgrade from a conventional storage-tank water heater—or you simply want a more energy-efficient system—understanding the pros and cons of gas versus electric tankless is crucial. This blog post will help you decide which option aligns best with your household’s hot water demands, budget, and long-term goals.
What Makes Tankless Water Heaters Attractive?
Tankless water heaters, whether gas or electric, stand out because they only heat water on demand. Instead of storing and maintaining a large volume of hot water around the clock, these units activate when you turn on a tap or shower. Once the demand stops, so does the heating process. That difference translates to potential energy savings, a smaller footprint, and effectively unlimited hot water when sized and installed correctly.
- Reduced Standby Energy Loss: Traditional tank water heaters lose heat through the tank walls, forcing the system to reheat water repeatedly. A tankless system eliminates this issue.
- Space Saving: Many models can be wall-mounted, freeing up floorspace in utility closets or garages.
- Longer Lifespan: A well-maintained tankless heater often lasts longer than a typical storage tank heater, though the exact service life depends on factors like water quality and regular maintenance.
Gas vs. Electric Efficiency
Both gas and electric tankless heaters tout improved efficiency over older, tank-based units, but the numbers can vary significantly:
- Electric Efficiency: Electric tankless units can often achieve 98–99% efficiency. They convert a high percentage of electricity into heat, which then transfers directly to the water. There’s very little energy loss.
- Gas Efficiency: Modern gas tankless models usually range from 80–95% efficiency, although some high-efficiency condensing models may claim even higher percentages. Natural gas (or propane) is often more affordable than electricity in some regions, but it’s less efficient in terms of direct energy conversion.
When choosing your system, remember that raw efficiency doesn’t always equal lower costs—local utility prices, home layout, and usage patterns also play a role in the final bill.
Heating Speed and Flow Rates
Faster Heating with Gas
One major selling point for gas tankless heaters is their ability to heat water quickly. Gas burners, especially on more robust models, can deliver a higher British Thermal Unit (BTU) output than many electric counterparts.
- Larger Households: If you have multiple bathrooms and a large family, higher BTUs mean better flow rates. That can translate into the ability to run two or three hot water fixtures at once without experiencing a noticeable temperature drop.
Steady, but Slower, with Electric
Electric tankless models typically have lower heating capacities. While 98–99% efficiency is fantastic on paper, an electric unit may struggle to keep up with simultaneous demand if your household uses a lot of water at once—particularly if you live in a cold climate where the incoming groundwater temperature is quite low.
- Small to Medium Homes: In many cases, electric models are perfectly adequate for a household of two to four people who don’t typically shower, run the dishwasher, and do laundry all at the same time.
- Supplemental Heating: Some homeowners opt for an electric tankless as a point-of-use system for a guest bathroom or an outdoor kitchen, especially if they don’t want to add additional gas lines or venting.
Installation Requirements: Venting and Space
Gas Models Need Proper Venting
A gas tankless heater burns natural gas or propane to heat water, producing combustion byproducts like carbon monoxide. Proper venting ensures these gases safely exit your home:
- Venting Complexity: Installation often requires stainless steel or Category III vents (for non-condensing units) or PVC vents (for condensing models). This process can add complexity and cost, particularly if you want to place the unit far from an exterior wall.
- Location Considerations: Gas tankless units are typically larger and require specific clearances around the burner and vent connections. Installing one in a tight space without adequate ventilation can be a safety hazard.
Electric Units Are More Compact
An electric tankless heater doesn’t need to vent exhaust, which can be a huge advantage in certain layouts:
- No Need for Exhaust Ducts: You won’t have to worry about running a flue through the roof or a side wall. This simplifies installations in condos, apartments, or smaller homes with limited mechanical space.
- Potential Panel Upgrades: However, going electric might require running new heavy-gauge electrical cables and possibly upgrading your home’s electrical panel. This can be especially true if you need a high-capacity unit to serve multiple fixtures.
Initial Costs vs. Long-Term Spending
Up-Front Unit Costs
- Gas Tankless: Depending on brand, size, and efficiency, a gas tankless heater can cost anywhere from $800 up to $2,500 for the unit alone. This price might climb once you factor in venting, gas line modifications, and professional installation.
- Electric Tankless: The typical price range often starts around $500, up to $1,500 or more for top-tier models. While the cost of the physical unit might be lower, remember that significant electrical work (like running multiple dedicated circuits) can eat into those savings quickly.
Operating Costs and Utility Rates
Operating costs hinge on local utility prices. In regions where natural gas is cheap and electricity is expensive, gas tankless units might deliver more savings over time. Conversely, if your local power rates are competitive—and especially if you have solar or some form of renewable energy—an electric system might be the more economical and eco-friendly option.
- Maintenance and Service: Gas tankless systems typically need annual checkups, burner inspections, and descaling. Electric models still benefit from regular flushing to remove scale buildup, but they have fewer parts that can malfunction.
- Energy Rebates: Some utilities or local governments offer incentives for installing energy-efficient appliances. Check to see if a particular model qualifies for rebates, which could tilt the balance in favor of either gas or electric.
Lifespan and Maintenance Differences
Gas Tankless: Durable but Needs Annual Care
Gas tankless units are designed to last around 20 years or more, assuming proper care. However, that durability comes with stricter maintenance:
- Descaling: Mineral buildup can reduce efficiency and compromise the heat exchanger. An annual flush with a descaling solution keeps internal components clean.
- Burner and Vent Inspections: A qualified technician should check for carbon monoxide leaks and ensure the venting is clear.
- Potential Noise: Between the burners igniting and fans expelling exhaust, gas tankless systems can be noisier than their electric counterparts. If you plan to install one near a bedroom, be mindful of the sound it produces when it turns on at odd hours.
Electric Tankless: Simpler, Quieter, but Shorter Life Expectancy
Electric tankless systems are known for being relatively quiet and straightforward since they don’t rely on combustion. However, they can have a shorter service life, sometimes closer to 15 years:
- Fewer Moving Parts: Without burners or exhaust fans, there’s less that can break. You’ll still want to flush the system periodically to prevent scale buildup on the heating elements.
- Panel Upgrades: If you had to invest heavily in electrical work during installation, that cost might pay off once you reach a replacement cycle, because your home is already set up to handle a second or third electric tankless install.
Environmental Considerations
Carbon Footprint and Emissions
If you’re installing a gas tankless heater, you’ll burn natural gas or propane on-site, generating direct emissions. Electric tankless models produce no on-site emissions, but the environmental impact depends on how your local grid generates power.
- Renewable Energy: If your region relies heavily on wind, solar, or hydro, an electric heater could be significantly greener. Some homeowners with solar panels effectively run their water heater off renewable energy, minimizing their carbon footprint.
- Fossil-Fueled Electricity: Conversely, if your area’s electricity primarily comes from coal or natural gas power plants, you’re still indirectly contributing to emissions—just at a different location.
Gas vs. Electric in Cold Climates
In regions with harsh winters, groundwater temperatures can dip sharply, requiring more energy to heat. Gas tankless heaters often handle cold climates more efficiently due to their higher BTU capacity. However, if you experience frequent power outages in winter storms, even a gas unit might have electronic ignition that fails without power—unless you install battery backup or a generator.
Practical Tips for New Construction and Retrofits
New Construction: Plan for Tankless Early
If you’re building a new home or undertaking a major renovation, deciding on a tankless water heater at the design stage can save you significant headaches:
- Gas Sizing: If you lean towards gas, ensure your builder accounts for a dedicated, appropriately sized gas line and any necessary vent runs.
- Electrical Capacity: For electric, talk to your contractor about installing the correct panel capacity and cable runs from the start. This approach is usually less expensive than upgrading your panel post-build.
Retrofits: Matching Your Existing Infrastructure
If you already have a gas tank water heater, a gas tankless upgrade may be simpler, provided the gas line is large enough and venting can be managed. Meanwhile, an electric tankless retrofit may be straightforward if your existing electrical panel has room for multiple high-amperage breakers.
- Assess Utility Setups: Confirm your gas meter can handle the extra BTUs for gas tankless or that your breaker panel has capacity for an electric unit.
- Weigh Long-Term Benefits: Even if an upgrade is costly now, consider how you might save on utilities or enjoy the convenience of endless hot water over many years.
Noise, Placement, and Daily Use
Noise Factors
Gas tankless heaters generate noise through their burners and ventilation system. If you plan to install it in or near a bedroom, that might disturb light sleepers. Electric heaters, by comparison, are almost silent aside from the sound of water moving through the unit.
Placement Choices
One of the major perks of tankless is flexible placement. You can mount the unit on a wall, sometimes even outside (especially for gas tankless, if local codes allow). Keep these pointers in mind:
- Proximity to Fixtures: The closer the tankless heater is to your bathrooms and kitchens, the shorter the wait time for hot water.
- Outdoor Installations: Gas tankless systems designed for outdoor use eliminate some venting challenges, but you’ll need to ensure freeze protection if you live in a colder climate.
Day-to-Day Experience
Once a tankless system is sized and installed properly, you’ll enjoy effectively unlimited hot water on demand. Long showers or back-to-back laundry loads no longer deplete a stored tank. Just keep in mind that exceeding the unit’s flow capacity (for instance, running multiple showers, the dishwasher, and a washing machine simultaneously) can cause a noticeable temperature drop.
Making the Decision: Key Questions to Ask
- What Are My Local Energy Rates? If electricity is very affordable or you have solar panels, electric may be the more cost-effective route in the long run.
- Do I Have Enough Gas Supply or Electrical Capacity? Upgrading a gas meter or an electrical panel can significantly alter initial costs.
- How Large Is My Household? A high flow rate might be essential if several family members use hot water at once. Gas tankless often excels here.
- Am I Sensitive to Noise? If so, electric’s near-silent operation could be a selling point.
- Do I Live in a Cold Climate? Gas tankless units typically handle colder incoming water more effectively, although an electric unit can still work if properly sized.
Routine Maintenance and Warranties
No matter which unit you choose, read the warranty details. Many manufacturers require annual maintenance—like descaling and inspections—to keep warranties valid. Skipping maintenance may lead to avoidable breakdowns or reduced efficiency.
- Descaling Kits: It’s possible to buy simple kits that circulate descaling solution through the tankless system, helping remove calcium or lime deposits.
- Water Filtration: If you live in an area with particularly hard water, a whole-home filtration or water softener system can significantly extend the life and efficiency of your tankless heater.
- Annual Checkups: Hire a licensed professional to check burner assemblies (for gas), electrical components (for electric), and overall performance at least once a year. Regular tune-ups not only meet warranty requirements but also catch small problems before they become big ones.
Conclusion: Which Tankless System Is Right for You?
Choosing between a gas or electric tankless water heater isn’t a one-size-fits-all decision—it hinges on factors like your home’s infrastructure, your local utility rates, and how you prefer to allocate your energy budget. Gas tankless heaters can offer rapid hot water for big households and often excel in cold climates, but they require venting, bigger gas lines, and annual burner checks. Electric tankless units, on the other hand, run quietly without venting needs and might be simpler to install in smaller homes, though they can demand expensive electrical upgrades.
Ultimately, the key is to weigh up-front installation challenges against long-term operating costs and comfort. If you’re building new or heavily remodeling, plan for tankless at the design stage to integrate the necessary gas or electric lines seamlessly. If you’re retrofitting an existing space, talk to a qualified plumber or contractor who can evaluate your home’s specifics—gas supply, electrical panel capacity, venting options—and guide you toward the best choice. With the right planning and proper maintenance, a tankless water heater—gas or electric—can be an energy-savvy, reliable solution that provides consistent hot water whenever you turn on the tap.
