Commercial Water Heaters in Dallas, TX

Tank, tankless or boiler-style

• Gas storage tanks. The usual pick for kitchens and laundromats: stored volume absorbs sudden heavy draws, and the burner rebuilds it between rushes.
• Tankless banks. Several wall-hung units on one rack share the load and cover for each other. They suit salons and offices with steady use but need a large gas supply and regular descaling.
• Hot water supply boilers. A high-input boiler heats into a separate storage tank, common in apartment buildings and large laundromats.
• Electric and booster units. Small electric heaters serve distant restrooms and break rooms; a booster lifts final-rinse water for a high-temperature dish machine.

Sizing to peak demand, not the average

Sizing starts with the heaviest hour: gallons drawn, target temperature and how cold the water arrives, which is colder in winter. The answer is the right mix of stored gallons and recovery, the rate the burner reheats water. Two mid-size heaters instead of one large unit keep some hot water flowing while one is serviced.

• Restaurants and bars in Deep Ellum, downtown, Bishop Arts and around Fair Park: dish machine, three-compartment sink, hand sinks and mop sink, often all at closing.
• Laundromats: every hot-fill washer starting on a weekend morning.
• Salons: shampoo bowls back to back for hours.
• Apartments and condos: a sharp morning peak plus a recirculation loop.

Gas line, venting and the city gas test

We add the heater's gas input to the fryers, ranges and furnaces already on the line and check pipe size and length back to the meter; if the total outgrows the meter, Atmos Energy has to set a bigger one. See tankless gas lines and restaurant gas lines.

Condensing heaters vent through plastic pipe, often out a side wall, and make acidic condensate that needs a drain and usually a neutralizer. Pulling an old heater off a shared chimney can leave the other appliance with a flue that no longer drafts well.

The City of Dallas gas test guidelines require a permit, city inspection and release for any change, addition or alteration to a gas system: a city plumbing inspector watches a 3 psi test on the piping for at least 15 minutes, then the city releases service to Atmos. The guidelines carve out replacing or repairing an approved appliance connector on the heater side of the shut-off; the heater itself still goes on a plumbing permit and city inspection. More on the Dallas gas test.

Code and health rules that affect the install

Installing or replacing a water heater in Dallas needs a plumbing permit, filed as a Commercial Plumbing Permit for business property; the plumber doing the work pulls the permit. The Dallas Plumbing Code is based on the 2021 International Plumbing Code (IPC).

• Hand sinks. Texas health guidance for food establishments calls for handwashing water of at least 100°F. Public restroom lavatories get tempered water (85°F to 110°F under the IPC) through an ASSE 1070 limiting valve, so a heater set hot for dishwashing needs mixing valves.
• Expansion tank. If cold water reaches a storage heater through a check valve, a pressure-reducing valve or another one-way valve assembly, an expansion tank goes on the cold supply downstream of all of them.
• Relief valve line. Full size of the valve outlet, no valves or tees, with an air gap in the same room as the heater. It ends between two pipe diameters and 6 inches above the floor or a waste receptor's rim, or discharges to the heater pan or outdoors, and is unthreaded at the end.
• Gas details. A shut-off and sediment trap at each heater, plus listed connectors.

The federal efficiency standard for new gas units

A U.S. Department of Energy final rule published October 6, 2023 set new minimums for commercial water heaters manufactured on and after October 6, 2026: 95 percent thermal efficiency for gas storage models and 96 percent for gas tankless units and hot water supply boilers. In practice only condensing designs reach those numbers. Commercial electric storage heaters were not changed.

On May 5, 2026, DOE said it will not seek civil penalties for covered gas models made before October 6, 2027, because the rule is being challenged in court, so the dates could still move. An installed heater can keep running and be repaired, since the rule applies to equipment as it's manufactured. When you replace, plan the vent and condensate drain for a condensing unit so the next heater fits too.

Planning a replacement to limit downtime

Rusty hot water, rumbling, a pilot that keeps going out or water at the base are signs to schedule the swap before the heater fails mid-shift.

1. Details: a photo of the rating plate and your business hours.
2. Site visit: gas, vent, drains, floor space and the path in.
3. Order and permit: the new heater is on site and the permit filed before anything is disconnected.
4. Swap around your hours: booked at a time that suits you, such as before opening or after close.
5. Inspection and setup: city inspection, temperatures set and staff shown the shut-offs.

Price depends on the heater, gas and vent changes, access and the permit. Coupons, including $150 off a new water heater, are on our coupons page; see also financing options.

Commercial water heater questions

Plan your commercial water heater

Call (844) 313-1397 with your rating plate and how your business uses hot water. We'll size the heater, check gas and venting, explain the permit and book the work around your hours. Dallas 24 PLUMBER holds Texas plumbing license # M-27587. See all commercial plumbing.

Office hours 8 AM–11 PM daily · 24/7 emergency service