In a commercial setting—whether it’s a busy restaurant, hotel, salon, gym, or medical facility—hot water isn’t just a convenience, it’s essential for operations. The challenge? Traditional tank water heaters often can’t keep up with high demand, and they waste energy keeping water hot 24/7. That’s why many businesses are switching to commercial electric tankless water heaters.
These systems heat water on demand, providing continuous hot water while saving space and cutting energy costs. In this guide, we’ll explore the best commercial electric tankless water heaters for 2025, what makes them stand out, and how to choose the right unit for your business. We’ll also cover maintenance tips and a critical but often-overlooked part of your plumbing system that can save you thousands in potential repairs.
Why Choose Electric for a Commercial Tankless Water Heater?
While gas units are common, electric tankless water heaters are becoming increasingly popular in commercial applications because:
- Lower installation cost: No venting or gas lines required.
- Precise temperature control: Keeps water at the exact temperature needed for sanitation or comfort.
- Energy efficiency: No standby heat loss—water is heated only when needed.
- Compact footprint: Wall-mounted units free up valuable floor space.
- Quiet operation: Ideal for noise-sensitive environments like offices or spas.
Best Overall: Stiebel Eltron Tempra 36 Plus
The Stiebel Eltron Tempra 36 Plus is one of the most trusted commercial electric tankless water heaters on the market. Known for its reliability, efficiency, and advanced features, it’s a top choice for medium to high-demand businesses.
- Capacity: Up to 7.5 GPM, depending on inlet water temperature.
- Temperature stability: Advanced flow control technology prevents temperature fluctuations.
- Build quality: German-engineered for long service life.
- Display: Digital temperature control in 1°F increments.
It’s an excellent fit for restaurants, gyms, and large offices that require consistent hot water performance.
Other Top Commercial Electric Tankless Water Heaters
Rheem RTEX-36
This high-capacity model offers powerful performance with a simple, user-friendly design. It can supply hot water for multiple fixtures simultaneously and is easy to install in a variety of commercial spaces.
EcoSmart ECO 36
A budget-friendly yet powerful unit, the ECO 36 can handle significant demand and is well-suited for businesses in warmer climates where incoming water temperatures are higher.
Bosch Tronic 6000C WH36
Known for durability and efficiency, the Bosch WH36 offers stable temperatures, a compact design, and straightforward controls. It’s ideal for smaller commercial settings with consistent usage patterns.
Eemax EEM24036
This unit delivers dependable hot water for medium-sized businesses and features a rugged design built to handle heavy daily use.
How to Choose the Right Commercial Electric Tankless Water Heater
When selecting a unit for your business, consider:
- Flow rate (GPM): Calculate your peak demand by adding the GPM of each fixture that could run simultaneously.
- Inlet water temperature: Colder climates require more powerful units to achieve the same output temperature.
- Electrical capacity: Ensure your electrical system can handle the amperage requirements—some commercial units require multiple breakers.
- Mounting space: Wall-mounted units save floor space but still require adequate clearance for servicing.
- Temperature controls: For certain industries, precise temperature settings are essential for safety and compliance.
Pro Tip: If your business experiences wide fluctuations in demand, choose a unit with advanced flow control to prevent hot water “surprises” during peak use.
Installation Considerations
Commercial electric tankless water heaters should always be installed by licensed professionals. Key points include:
- Upgrading electrical panels if necessary.
- Properly sizing wires and breakers according to manufacturer specifications.
- Mounting the unit where it’s easily accessible for maintenance.
- Following all local building and safety codes.
Maintenance for Long-Term Performance
With regular maintenance, a commercial electric tankless unit can last 20 years or more. Maintenance tips include:
- Flushing the unit periodically to remove scale buildup (especially in hard water areas).
- Inspecting heating elements and replacing them if efficiency drops.
- Checking all electrical connections annually.
- Cleaning inlet filters to maintain optimal flow.
The Overlooked Side of Commercial Plumbing
Hot water is critical for your business, but so is the system that handles wastewater. If your facility uses a septic system, heavy water usage from a commercial tankless heater can put additional strain on it.
Neglecting septic maintenance can lead to foul odors, slow drains, and costly business disruptions.
SEPTIFIX – Keep Your Septic System Healthy
SEPTIFIX is the #1 septic tank treatment in the US, trusted by both homeowners and businesses. These flushable tablets release oxygen and beneficial bacteria to break down waste, grease, and sludge while neutralizing odors.
Benefits include:
- Removes unpleasant odors within days.
- Prevents costly septic backups and pump-outs.
- Safe for all plumbing and septic systems.
- Simple to use—flush one tablet per month.
For businesses that rely on uninterrupted operations, SEPTIFIX offers peace of mind and protection from unexpected plumbing disasters.
Final Thoughts
In 2025, the Stiebel Eltron Tempra 36 Plus leads the pack as the best commercial electric tankless water heater thanks to its high capacity, precise temperature control, and proven durability. Other excellent options include the Rheem RTEX-36, EcoSmart ECO 36, Bosch Tronic 6000C WH36, and Eemax EEM24036.
Whichever unit you choose, remember that hot water is only half the equation. Keeping your septic system healthy with SEPTIFIX ensures your plumbing works flawlessly, protecting your investment and your reputation.
Order SEPTIFIX Today – Protect Your Septic Tank and Keep Your Business Running Smoothly
Reliable hot water plus a healthy septic system? That’s the winning combination for any commercial property.