Commercial tankless water heaters in Houston

Built around how your business uses hot water.

The cost of keeping a tank hot.

Most commercial properties still run oversized tank boilers that waste thousands of dollars a year keeping water hot that nobody is using. A standard 100-gallon commercial tank loses 15 to 20 percent of its energy just keeping water hot overnight. Nobody is using a drop, but the burner cycles on and off every 30 to 45 minutes, all night, every night. Multiply that across a restaurant running two 100-gallon tanks and you’re burning $300 to $500 a month in standby heat loss alone.

A tankless burner fires only when someone opens a tap, starts a dishwasher or runs a load of laundry. For a Houston restaurant doing 200 covers a night, that means gas savings of 30 to 40 percent, and for a 50-unit apartment complex the numbers are even more dramatic. The energy savings matter, but the real reason commercial properties switch is running out of hot water during peak hours, and losing business because of it: dishes piling up in a restaurant, angry guests in a hotel, maintenance complaints in an apartment building.

Restaurants and food service.

Health codes set dishwashing temperatures. A three-compartment sink needs 110°F for washing and 140°F for the final sanitizing rinse, and commercial dishwashers pull 2 to 3 GPM continuously during cycles. We design systems that hold those temperatures under full kitchen load, without the drops that trigger health inspection flags.

Hotels and hospitality.

A 60-room Houston hotel at 85% occupancy on a Friday night might have 40 to 50 showers running between 6 and 8 a.m.: 80 to 100 GPM of demand in a two-hour window. We have designed cascade systems for boutique hotels in Montrose and extended-stay properties in the Energy Corridor that handle those peaks without a single guest complaint.

Apartments and multi-family.

Central boiler systems in older Houston apartment buildings are expensive to maintain and inefficient by modern standards. We work with property managers to retrofit buildings with tankless systems, either a central cascade in the mechanical room or individual units for each apartment. The per-unit approach eliminates common hot water complaints and lets property managers bill hot water usage directly to tenants.

Salons, spas and gyms.

Demand swings widely. A salon might run six shampoo bowls at once during peak hours and none on a slow Tuesday morning. Tankless systems handle that better than any tank, because they scale output to real-time demand instead of keeping hundreds of gallons hot all day.

Condensing or non-condensing.

Non-condensing units run at about 80 to 85 percent thermal efficiency and lose 15 to 20 percent of the gas they burn as exhaust heat. Condensing units recapture that heat with a secondary heat exchanger and reach 95 to 98 percent. For a Houston restaurant running hot water 14 hours a day, the gap between 82% and 96% efficiency is worth $200 to $350 a month in gas, or $48,000 to $84,000 over the 20-year life of the system.

Condensing units typically cost $800 to $1,200 more per unit, and the payback is usually under 18 months in high-volume commercial applications. They are our default for commercial projects in Houston, unless the volume doesn’t justify the premium.

Turndown ratios prevent short-cycling.

A unit’s turndown ratio is how low it can modulate its flame. At 10:1, it can run at 10% of its maximum BTU when demand is light. Without that range, a unit fires at full blast for a single hand-wash sink, overshoots the temperature, shuts off and fires again as the water cools. That short-cycling stresses the ignition system, the gas valve and the heat exchanger. Units that modulate smoothly run at just the output needed, with less stress, a longer life and lower repair costs.

Monitoring from your phone.

Most commercial tankless units now include Wi-Fi and digital control panels. Property managers running several Houston locations can check water temperature, system status and error codes from a phone. If a unit throws a fault at your Galleria hotel at 2 a.m., you’ll know before your front desk does. On cascade systems, the controller also logs runtime for each unit, which helps us plan maintenance around actual use instead of a generic calendar.

Permits and paperwork.

Every commercial water heater installation in Houston requires a permit through the City of Houston or your local jurisdiction. We pull all permits, schedule the inspections and make sure your system passes on the first visit. Our license, insurance and bonding documentation is current and available to any property manager or landlord who needs it for their records.

What goes wrong, and how we fix it.

Over 20 years of commercial work means we can walk into a restaurant mechanical room, look at the existing plumbing and know within 15 minutes exactly what the project will involve. Commercial installations fail for predictable reasons: undersized gas lines, insufficient combustion air, improper venting slope and cascade controllers that aren’t programmed correctly. We have been called in to fix other companies’ commercial installs more times than we can count.

A property management group in the Heights hired us to troubleshoot a four-unit Navien cascade that had never worked properly since installation. The previous installer had used ½-inch gas lines where 1-inch lines were needed and had never configured the lead-lag rotation on the cascade controller. Three of the four units showed error codes within the first six months. We re-piped the gas supply, reprogrammed the controller and flushed all four heat exchangers. The system has run for two years without a single fault.