Best Commercial Tankless Water Heaters for Businesses and Multi-User Spaces
For facilities that demand reliable, on-demand hot water across multiple fixtures, commercial tankless water heaters offer space-saving efficiency and scalable performance. This guide highlights five top models suitable for commercial kitchens, offices, and small to mid-size commercial spaces. Each option balances flow, energy source flexibility, and installation versatility to help facilities choose with confidence. Below, you’ll find a quick product summary, followed by detailed sections with technical features and practical considerations to aid comparison and selection.
Summary Table
| Product | Brand | Approx. Max Flow (GPM) | Energy Type | Typical Use |
|---|---|---|---|---|
| Rinnai CX199iN Condensing | Rinnai | 11.1 | Natural Gas or Propane | Commercial, indoor/outdoor versatile |
| NEW Rinnai RX199iN Condensing Smart Sense | Rinnai | 11.1 | Natural Gas or Propane | Compact, high-demand environments |
| APUS 190,000 BTU Outdoor | APUS | 8.1 | Propane | Outdoor commercial setups |
| Westinghouse APOLO 120,000 BTU | Westinghouse | Up to 5.1 | Natural Gas | Indoor or light commercial |
| FOGATTI 180,000 BTU Outdoor | FOGATTI | Up to 8.1 | Natural Gas | Outdoor installations, multi-outlet use |
Rinnai CX199iN Condensing Smart Sense
The Rinnai CX199iN is a high-efficiency condensing tankless unit designed for commercial use, with a rated output of 199,000 BTU. It supports either natural gas or propane and can be installed indoors or outdoors with Versa Vent, expanding placement options in busy facilities. An RX-OVC vent cap is recommended for outdoor installations. Its efficiency rating helps reduce ongoing energy costs in commercial settings where hot water is in constant demand. Optional conversion kits support recirculation, aiding hot water management across fixtures.
Key considerations for this model include installation flexibility, the potential cost savings from its high efficiency, and the need to plan venting and space accordingly. For facilities prioritizing quick hot water delivery and reliable performance, this unit provides a strong balance of flow and energy efficiency, particularly where multiple outlets may be in use simultaneously.
NEW Rinnai RX199iN Condensing Smart Sense
The RX199iN is a compact, high-capacity tankless water heater designed for both indoor and outdoor installation. It runs on either propane or natural gas and delivers up to 11.1 GPM, suiting medium to larger commercial facilities that require multiple fixtures to operate at once. Its Smart Sense control supports efficient operation, while the Versa Vent system provides flexible placement. A modern interface and a Quick Flush feature simplify maintenance, and a WiFi control module (sold separately) adds remote management capabilities for monitored performance in commercial contexts.
Practical considerations for choosing this model include space constraints, venting planning, and whether remote monitoring is desired for facility management. The unit’s compact footprint makes it suitable for smaller mechanical rooms while still delivering robust hot water for commercial needs.
APUS 190,000 BTU Outdoor Tankless
APUS Outdoor Tankless Water Heater delivers 190,000 BTU with 8.1 GPM, designed for whole-home use in outdoor environments. It supports up to three showers and two faucets simultaneously with a minimum flow of 0.79 GPM, suitable for busy commercial spaces with outdoor installation needs. The unit offers WiFi and remote control via its app, enabling precise temperature management (95°F–149°F) and convenient operation. The compact outdoor form factor helps preserve interior space while providing reliable hot water at demand.
When evaluating APUS, consider outdoor exposure, wiring, and gas supply routing. The WiFi-enabled controls provide a modern touch for facility managers seeking remote oversight, though it’s essential to ensure weather protection and proper venting for outdoor operation.
Westinghouse APOLO 120,000 BTU Indoor
The Westinghouse APOLO model offers 120,000 BTU with up to 5.1 GPM, designed for indoor installation in commercial or small-to-medium facilities. It includes smart temperature control through an LED display and app compatibility for remote adjustments. Its non-condensing design focuses on straightforward operation and reliable performance for spaces with steady demand. The compact unit benefits installations where wall space is at a premium and where moderate hot water output suffices for multiple fixtures, such as offices or small kitchens.
Key considerations include its maximum flow rate and whether the space requires more than 5.1 GPM. If higher simultaneous demand is anticipated, pairing multiple units or opting for a higher-capacity model may be necessary. This unit emphasizes ease of use and simple maintenance in a commercial setting.
FOGATTI Natural Gas Outdoor Tankless
FOGATTI’s outdoor tankless unit delivers up to 180,000 BTU and 8.1 GPM, designed for outdoor installation and multi-outlet use. The four-stage combustion system and temperature sensors provide steady heating with a ±1°F precision, ensuring comfortable water temperatures across showers and sinks. The unit features a bottom-mounted fan to optimize combustion and safety against backflow, making it reliable in varied climates. Its outdoor-focused design suits commercial setups that require robust performance in external environments.
In evaluating FOGATTI, facilities should assess outdoor exposure, venting, and maintenance access. The model’s strong flow and durable construction make it a solid choice for restaurants or offices with outdoor utility spaces, where indoor footprints are limited and demand is substantial.
Buying Guide: Key Purchase Considerations And Comparisons
- Flow requirements: Determine the peak GPM you’ll need across all active fixtures. Commercial units vary from roughly 5 GPM to 11 GPM or more; choose models that exceed your anticipated simultaneous demand.
- Gas vs. electric: Gas-fired units generally offer higher flow for commercial use, while electric models are excellent for smaller spaces or where gas lines aren’t available. Consider utility capacity and venting needs.
- Indoor vs. outdoor installation: Outdoor units require weather protection and robust venting. Indoor installations benefit from compact footprints but may demand higher clearances and ventilation planning.
- Ventilation and venting: Condensing units often use common venting; ensure compatible vent components (like Versa Vent) and outdoor-cap compatibility when installing outside.
- Recirculation and hot water management: Some models offer optional recirculation kits to reduce wait times for hot water, improving perceived efficiency in larger facilities.
- Control and monitoring: Advanced controls, WiFi modules, and quick-flush maintenance features can reduce downtime and simplify service in commercial environments.
- Maintenance access: Plan for easy access to service ports, filters, and electrical connections to minimize disruption in busy facilities.
- Electrical requirements: Electric models may require dedicated circuits or higher service panels (e.g., 3x40A for some 24 kW units). Verify electrical availability and space for panel upgrades if needed.
- Code compliance: Ensure chosen models meet local codes and CSA/UL listings for commercial use and any outdoor installations in your region.
- Cost of ownership: Beyond purchase price, account for installation, venting, maintenance, and potential energy savings from high-efficiency operation.
Selecting the right commercial tankless water heater involves balancing hot water demand, installation constraints, and ongoing operating costs. For facilities with high simultaneous demand, multi-unit configurations or higher-flow models may be warranted. In environments with outdoor installations or limited interior space, outdoor units paired with proper venting can offer practical solutions. This guide outlines representative options to compare when planning a commercial upgrade or new installation.