Best Commercial Water Heaters – Reliable & Efficient Choice

Last Updated on May 12, 2025

You’ll want commercial water heaters that provide reliable hot water, save on energy, and fit your business needs. Top picks for 2025 include models like the EcoSmart ECO 18 and Stiebel Eltron Tempra 36 Plus, offering tankless designs with high efficiency and digital controls.

GE’s 18 Gallon Plug and Play suits smaller setups, while options with WiFi let you monitor remotely. Each balances power, flow rate, and installation ease—explore how to match the perfect unit to your business.

Key Takeaways

• EcoSmart ECO 18 offers 60% energy savings with compact, on-demand heating and ideal for tight commercial spaces.
• Stiebel Eltron Tempra 36 Plus provides unlimited hot water at 4.5 GPM with precise temperature control.
• Electric tankless heaters (27kW to 36kW) deliver high flow rates up to 6.5 GPM and 99%+ efficiency, suitable for multiple simultaneous uses.
• WiFi-enabled models offer remote temperature control and advanced safety features, enhancing convenience and operational monitoring.
• Professional installation and maintenance ensure compliance, reliability, and extended lifespan for commercial water heating systems.

EcoSmart ECO 18 Electric Tankless Water Heater (18 KW, 240V, White)

If you need a reliable water heater that delivers nearly endless hot water while cutting energy costs, the EcoSmart ECO 18 Electric Tankless Water Heater is a smart choice.

With 18 KW power at 240 volts, it efficiently heats water on demand, saving up to 60% on energy. Its compact design (17 x 14 x 3.5 inches) fits easily in tight spaces, and the digital temperature control lets you set precise heat levels.

You’ll appreciate its 99.8% efficiency on key components, making it perfect for businesses seeking consistent, cost-effective hot water solutions.

Best For: Homeowners or small businesses seeking an energy-efficient, compact, and reliable electric tankless water heater that delivers continuous hot water with precise temperature control.

Pros:

• Saves up to 60% on water heating costs with self-modulating technology.
• Compact design fits easily in tight spaces and offers digital temperature control in 1°F increments.

Cons:

• Requires professional or experienced DIY installation with specific electrical requirements.

GE Appliances 18 Gallon Plug and Play Electric Water Heater with Adjustable Thermostat

The GE Appliances 18 Gallon Plug and Play Electric Water Heater with Adjustable Thermostat is perfect for anyone needing a compact, easy-to-install solution that fits limited spaces like kitchens or RVs.

You’ll appreciate its plug-and-play design, connecting effortlessly to any 120-Volt supply with standard 3/4-in NPT plumbing. It heats water up to 140°F, ideal for small dwellings or single hookups.

The adjustable thermostat lets you control temperature easily, while the stainless steel heating element guarantees durability. Installation is quick with basic tools, though some users mention extra costs for parts.

Best For: Individuals or small households seeking a compact, easy-to-install electric water heater for limited spaces like kitchens, RVs, or laundry rooms.

Pros:

• Plug-and-play design for quick installation with standard 120-Volt and 3/4-in NPT plumbing.
• Adjustable thermostat allows precise temperature control up to 140°F.
• Durable stainless steel heating element and anode rod.

Cons:

• Limited capacity suitable only for single hookups or small dwellings.

Stiebel Eltron Tempra 36 Plus Tankless Electric Water Heater

You’ll appreciate the Stiebel Eltron Tempra 36 Plus Tankless Electric Water Heater if your business demands a continuous, on-demand supply of hot water without the energy waste of traditional tanks.

This sleek, space-saving unit delivers unlimited hot water with 27 kW power, using 15-20% less energy by eliminating standby heat loss. It supports multiple simultaneous uses, thanks to precise temperature control and a max flow rate of 4.5 GPM.

While installation may require electrical upgrades prove it’s a reliable, efficient choice for commercial needs.

Best For: Businesses and households seeking a reliable, energy-efficient tankless water heater that provides continuous hot water on demand with precise temperature control and supports multiple simultaneous uses.

Pros:

• Uses 15-20% less energy than conventional electric tank heaters by eliminating standby heat loss.
• Provides continuous, unlimited hot water with adjustable temperature settings and supports multiple simultaneous points of use.

Cons:

• Requires professional installation and may need electrical service upgrades, increasing initial costs.

Electric Tankless Water Heater 27kW 240V with LED Temperature Display

Experience instant hot water on demand with the Electric Tankless Water Heater 27kW 240V, designed for homeowners seeking efficient, space-saving solutions.

This compact unit offers up to 6.5 GPM flow rate, perfect for 2-4 usage points. You’ll appreciate its 99.8% efficiency and LED temperature display, allowing precise adjustments from 86°F to 131°F.

Safety features include leakage and overheating protection, ensuring peace of mind. Installation is straightforward with included manuals and templates.

While generally reliable, some users note breaker trips in larger households, so upgrading water lines may be necessary. Overall, it’s a smart, energy-saving choice for your home.

Best For: homeowners looking for an energy-efficient, space-saving water heater that provides instant hot water for 2-4 usage points.

Pros:

• High energy efficiency with 99.8% thermal efficiency, saving up to 60% on heating costs.
• Compact, wall-mounted design ideal for limited space installations.
• Precise temperature control with LED display and multiple safety features for peace of mind.

Cons:

• May cause breaker trips in larger households without electrical or plumbing upgrades.
• Maximum temperature capped at 131°F, which may be insufficient for some users.

Electric Tankless Water Heater 36KW 240V with WIFI Remote Control (WN36)

If you manage a commercial space needing reliable hot water for up to five simultaneous users, the Electric Tankless Water Heater 36KW 240V with WIFI Remote Control (WN36) fits perfectly.

This compact, wall-mounted unit saves space and offers up to 99% energy efficiency. You’ll enjoy endless hot water on demand, controlled remotely via WiFi for easy temperature adjustments. Safety features like leakage and overheat protection give peace of mind.

While installation requires professional help due to electrical specs, its performance and energy savings make it ideal for busy businesses seeking efficient, consistent hot water without the bulk of traditional tanks.

Best For: Commercial spaces or busy households needing efficient, on-demand hot water for up to five simultaneous users with energy savings and remote control convenience.

Pros:

• Compact, space-saving wall-mounted design occupies 90% less space than traditional tanks.
• High energy efficiency with up to 99% savings and no energy use when idle.
• WiFi remote control for easy temperature adjustments and safety features including leakage and overheat protection.

Cons:

• Requires professional installation due to complex electrical requirements.
• Maximum flow rate may limit use with very high simultaneous demand.

Rheem RTGH-95DVELP-3 Tankless Liquid Propane Water Heater with WiFi

The Rheem RTGH-95DVELP-3 Tankless Liquid Propane Water Heater with WiFi suits businesses that demand reliable, high-efficiency hot water on demand.

It delivers up to 9.5 GPM, supporting multiple simultaneous applications without cold water bursts thanks to Hot Start Programming.

You can control and monitor it remotely via EcoNet Wi-Fi Technology, while LeakGuard protects your property from water damage.

Its compact, wall-mounted design saves space, and with an impressive 0.93 efficiency rating, it cuts energy costs by operating only when needed.

Professional installation is advised, and maintenance alerts come straight to your phone.

Best For: Businesses and households seeking a reliable, high-efficiency tankless water heater with smart features and the capacity to supply multiple fixtures simultaneously.

Pros:

• Provides continuous hot water at a high flow rate of 9.5 GPM, ideal for multiple simultaneous uses.
• Includes advanced features like Hot Start Programming, EcoNet Wi-Fi remote control, and LeakGuard protection.
• High energy efficiency rating (0.93) helps reduce energy consumption and costs.

Cons:

• Requires professional installation due to system complexity.

Tankless Tech: Factors to Consider When Choosing a Commercial Water Heater

When choosing a commercial water heater, you’ll want to focus on energy efficiency ratings to save on costs and reduce environmental impact.

Energy Efficiency Ratings

Energy efficiency ratings play an essential role in selecting the right commercial water heater for your business. You’ll want to look closely at the Energy Factor (EF), which measures how much hot water a unit produces per unit of fuel consumed—higher EF means better efficiency.

Tankless water heaters often reach up to 99% efficiency since they heat water only when needed, avoiding standby heat loss common in tank models. Choosing ENERGY STAR-certified models guarantees compliance with U.S. Department of Energy standards and offers potential cost savings.

Additionally, electric water heaters with self-modulating technology adjust energy use based on water temperature and flow, cutting consumption. Don’t forget to take into account units with high insulation ratings to minimize heat loss and lower your operational costs effectively.

Capacity and Flow Rate

Anyone choosing a commercial water heater needs to analyze capacity and flow rate carefully, as these factors determine how much hot water you can deliver during peak demand.

Flow rate, measured in gallons per minute (GPM), lets you know how many fixtures like sinks and showers can run simultaneously without temperature drops. You’ll want to match the heater’s capacity to your business’s specific needs, considering user numbers and appliance types.

Don’t forget about temperature rise, which is the difference between incoming water temperature and the desired hot water temperature; it directly impacts how much capacity and flow rate you require.

Since commercial heaters must handle continuous, high-demand use, evaluating both peak and off-peak flow rates guarantees you maintain a steady hot water supply throughout busy periods.

Fuel Type Options

Selecting the right fuel type plays an essential role in optimizing the performance and cost-effectiveness of your commercial water heater. You can choose from electricity, natural gas, propane, or solar energy, each with distinct advantages.

Electric models often cost less upfront and install more easily but might lead to higher energy bills. Natural gas heaters heat water faster and supply it continuously, ideal for busy businesses. If natural gas isn’t available, propane offers similar efficiency and performance.

Solar water heaters cut energy costs considerably and benefit the environment, though they need a higher initial investment and sufficient sunlight. Consider your location, energy availability, and budget to pick the fuel type that best supports your business needs while maximizing efficiency and savings.

Installation Requirements

While choosing a commercial water heater, you’ll need to evaluate its installation requirements carefully. First, check the electrical needs—some models demand dedicated circuit breakers and specific wiring gauges for safe, efficient operation.

You might also face upgrades to your electrical panel if the unit draws higher amperage. Make sure the physical space suits the heater, allowing enough clearance for maintenance and proper airflow, especially for gas-fired or vented models.

Proper plumbing connections are essential too; water inlet and outlet sizes must match your unit’s specs to prevent leaks. Finally, professional installation is often necessary to meet local building codes. Planning these factors upfront saves time, money, and hassle in the long run.

Durability and Materials

Because durability directly affects your water heater’s performance and lifespan, you should prioritize the materials used in its construction. Opt for models made with stainless steel or copper, as these resist corrosion better than plastic or low-grade metals, ensuring longer service life.

High-quality insulation also plays a key role by reducing heat loss, which boosts energy efficiency and protects internal components. Additionally, consider the maximum operating pressure; commercial heaters designed for pressures around 150 PSI require sturdy materials and solid construction to withstand stress.

Don’t forget regular maintenance, especially inspecting the anode rod in tank heaters, to prevent corrosion and keep your water heater reliable over time.

Temperature Control Features

When you rely on a commercial water heater, precise temperature control becomes essential to meet your business’s varying needs. Look for models that let you set and maintain specific temperatures, often adjustable in fine increments like 1°F, ensuring consistency during peak demand.

Modern heaters often feature digital controls and LED displays for easy monitoring and adjustments, enhancing operational efficiency. Some advanced units use self-modulating technology to optimize energy use by adjusting power based on incoming water temperature and demand, saving costs.

Additionally, remote temperature control through smartphone apps offers convenient, real-time management from anywhere.

Choosing a water heater with these advanced temperature control features helps you maintain a steady hot water supply, improves energy efficiency, and adapts smoothly to your business’s fluctuating requirements.

Safety Certifications

If you want to guarantee your commercial water heater operates safely and reliably, you need to check for recognized safety certifications. Certifications like UL, ANSI, and CSA confirm the unit meets strict safety standards covering electrical safety, pressure management, and construction materials.

These certifications mean your water heater has undergone rigorous testing for durability and performance, reducing risks like leaks or overheating.

Additionally, certified units often require regular inspections, helping maintain long-term safety and reliability. Choosing a heater with these marks not only protects your business but also assures compliance with local building codes and regulations.

Prioritizing safety certifications gives you peace of mind, knowing your equipment meets industry standards and operates without unnecessary risks.

Maintenance and Service

Ensuring your commercial water heater stays safe starts with more than just certifications; ongoing maintenance and service play a key role in keeping it running efficiently. Regular upkeep can extend your unit’s lifespan, from 1 to 15 years depending on the manufacturer and parts.

Keep spare components like heating elements and anode rods handy to reduce downtime during repairs. Modern heaters often include self-diagnostic features that alert you to issues early, boosting reliability.

Since water quality affects performance, installing filtration systems prevents mineral buildup and prolongs heater life. For complex systems, always rely on professional servicing to meet local regulations and avoid safety risks during installation or maintenance, ensuring your business stays compliant and operational.

Frequently Asked Questions

How Often Should Commercial Water Heaters Be Professionally Serviced?

You should have your commercial water heater professionally serviced at least once a year to keep it running efficiently and avoid unexpected breakdowns.

If your business uses it heavily, consider scheduling maintenance every six months. Regular servicing helps catch issues early, improves energy efficiency, and extends the unit’s lifespan.

Don’t wait for problems to arise staying proactive guarantees your water heater performs reliably when you need it most.

What Safety Features Are Essential for Commercial Water Heaters?

You need to look for safety features like automatic shut-off valves, temperature and pressure relief valves, and overheat protection. These prevent dangerous overheating or pressure buildup.

Anti-scald devices protect users from burns, while leak detection systems alert you to water leaks early.

Also, confirm your heater has proper ventilation to avoid carbon monoxide buildup. These features keep your commercial water heater safe and your workspace secure.

Can Commercial Water Heaters Be Integrated With Existing Building Management Systems?

Yes, you can integrate commercial water heaters with existing building management systems. Doing so allows you to monitor and control temperature, energy usage, and maintenance alerts remotely.

Many modern units come with smart controls and communication protocols compatible with popular BMS platforms. This integration helps you optimize efficiency, reduce costs, and guarantee safety.

Just make sure your water heater and building system support the same communication standards before installation.

How Do Water Quality and Hardness Affect Commercial Water Heater Performance?

Did you know that hard water can reduce a water heater’s efficiency by up to 30%? When you deal with hard water, minerals like calcium build up inside your commercial water heater, causing scale that lowers heat transfer and increases energy usage.

This buildup can lead to corrosion and shorten your unit’s lifespan. To keep your water heater performing well, consider water softening or regular maintenance to manage water quality and hardness effectively.

ConclusionChoosing the Right Fit: Power, Flow Rate & Installation Made Easy

Choosing the right commercial water heater is like picking the engine that drives your business’s comfort and efficiency. You want a model that not only meets your hot water needs but also saves energy and cuts costs.

Whether you go electric or propane, tankless or traditional, these top picks offer reliable performance to keep your operations running smoothly. Invest wisely, and you’ll keep the water and your business flowing without a hitch.

Last update on 2025-05-12 / Affiliate links / Images from Amazon Product Advertising API