Atlanta brewery chooses tankless system over steam boiler to supply 10,000 gal. of hot water daily.
Needing large volumes of hot water delivered continuously and at consistently correct—and often very high—temperatures was the prime driver behind Monday Night Brewing’s (MNB), Atlanta (mondaynightbrewing.com), move to tankless hot-water heaters at The Garage, the six-year-old company’s second Atlanta brewhouse.
Located in the southwest section of the city, the new MNB barrel-aging and souring facility consumes approximately 10,000 gal. of hot water daily in its beer-making processes. For example, water at a temperature of 150 F is combined with barley and hops to produce an enzymatic reaction that yields a sugar. This watery “mash” then is mixed with yeast to become alcohol.
Elsewhere inside The Garage, 180 F water is used to steam and sterilize its collection of wine, whiskey, and rum barrels that give the various brews their distinctive flavors. “This sanitation of the wood is a critical piece of the operation,” explained MNB co-founder Joel Iverson. “We could do chemical sanitation of our equipment, but the best way to ensure a clean and sterile environment is hot water. And by ‘hot water,’ I mean no less than 180 F.”
While attending a brewing industry conference, Iverson spoke with a fellow brewmaster about MNB’s plans for The Garage and the need for a more reliable source of hot water. Iverson’s new friend mentioned that a number of smaller breweries had taken to experimenting with tankless technology, jerryrigging two or more units together to get the hot water they needed.
Iverson didn’t care for the idea of “hacking” water heaters together to build a makeshift system, but he was intrigued enough to begin researching the possibilities of connecting multiple units to generate the hot water he needed. He subsequently learned that Noritz America, Fountain Valley, CA (noritz.com), offered a prefabricated system, including a central controller, and immediately thought, “That’s exactly what we need.”
“I contacted the manufacturer’s headquarters in California and walked them through my sizing calculations for the maximum flow rate of approximately 16 gal. per minute at 180 F, Iverson said. Working back from that metric, Noritz tech support helped Iverson determine that he needed a 1 million-BTU system, with five heaters connected in a series.
Throughout his work with Noritz, Iverson and his colleagues never wavered from their conviction that tankless was the right choice. “Our lone concern was: What happens if a sudden need for an unusually high volume of hot water arises? So we devised a creative way to deal with that in the form of a 150-gal. holding tank,” said Iverson. “This backup tank is not absolutely required, but it does provide reassurance and peace of mind.”
Affordable system redundancy
Among the factors persuading MNB management they were on the right track with tankless was a sharply lower acquisition cost. Iverson figures a million-BTU steam boiler would have demanded double the price of the prefabricated tankless system, installed.
Prefabrication of the rack system accounted for some of the tank-versus-tankless cost gap, thanks to a dramatic reduction in labor time and expense. Compared with tankless, a steam boiler is a far more complicated, labor-intensive install. “Much of the time and expense is the steel pipe needed to connect the boiler to equipment, all of which must be insulated,” Iverson explains. “Then there are all the relief valves and other safety devices required by code. Steam boilers must also undergo regular inspections by the state, another major cost.”
It’s not a perfect apples-to-apples comparison between a steam boiler and tankless, he admits, but he harbors no doubt about the more attractive economics of the latter. “We should have lower gas bills simply because tankless is on-demand. We won’t be heating water all the time, but only when we need it,” he said. This benefit is somewhat muted by the comparatively low natural-gas prices right now, admitted Iverson, but “it was the up-front savings in equipment and labor that tipped the scales in favor of tankless.”
The other major attraction for MNB was system redundancy, which should all but eliminate downtime during servicing situations. “Shutdowns are a big negative in any brewery,” noted Iverson, who said the occasions when all five will operate simultaneously should be few. “That means, when maintenance for one unit is required, one or more of the other four will remain online, so we can continue brewing beer.”
The solution to MMB’s demanding hot-water needs was five, high-efficiency (95%) water heaters. The Noritz Model NCC1991-DV condensing units were pre-engineered, prefabricated, and pre-plumbed with a system controller by Trumbull Industries in Warren, OH (trubmull.com), as a single, integrated package on a metal rack before being shipped intact to Atlanta—resulting in a major savings in installation labor. Their combined maximum inputs total 999,500 Btu/hr., meeting not only the brewing and sanitation requirements of the beer-production process, but also the general hot-water service needs of the rest of the 22,000-sq.-ft. structure.
If not exactly “plug-and-play,” the prefabricated, pre-plumbed tankless system simplified the installation considerably. Besides mounting the heaters to the rack, three in the front and two in the back, the two-man Trumbull team in Ohio also made all the internal water and gas connections prior to shipment. When the unit arrived at The Garage, plumbing installer David Mansfield of Mansfield Contracting Inc., Conyers, GA, had to make only three connections—hot water, cold water, and gas—for the entire assembly, rather than three for each of the five units—an 80% reduction in connections.
As for the controller, the primary concern was to connect each of the five pre-installed cords to its appropriate unit with no wires hanging slack. Otherwise, this prefabbed piece, which can be hung virtually anywhere nearby, typically takes only a half-hour to install.
The gas lines and vent runs were another matter. Owner David Hardegree of Hard-Cas Mechanical LLC, Winder, GA, and project manager Tim Casper installed 3,000 ft. of 2-in. black iron pipe at The Garage, to service various appliances, including HVAC equipment, 12 gas lamp posts, and a fire pit for brewery guests, plus the tankless setup, which needed 1,000 ft. by itself. Describing the installation as a “massive undertaking,” Hardegree estimated the gas-pipe installation spanned a week.
Each tankless water heater is vented separately with a 20-ft. vertical stack of 4-in. Schedule 80, high-pressure PVC pipe. Each stack consisted of a pair of 20-ft. lengths connected with a Schedule 40 PVC fitting. The five runs merge at the roof into a specially prefabbed, 3- x 3- x 3-in. wye fitting. The venting terminates in a 5-ft., vertical length of concentric piping, 5 in. in diameter. The inside pipe, which delivers makeup air, is encased in a slightly wider pipe that removes the exhaust.
The venting setup required two days, said Hardgree, “including a day on a scissor lift, after the manifold was set, to rough-in most of the pipe; and a second day to top it all out on the roof.” But whatever the challenges of the gas and vent runs, Hardegree has only compliments for the tankless rack system, which had to be carefully squeezed into The Garage’s 8-ft.-square mechanical room.
“It was a tight fit, no question,” he remembered, “but once the rack was in place, the heaters themselves were ready to go. If we had to mount each of them on the wall, we might’ve needed another week. Prefabrication made the installation so much easier.”
From Hobby To Business Enterprise
Hear the name, and you might well conclude that Monday Night Brewing must be connected to football: a bunch of “bros” watching the pros on TV, September through December. In fact, the venture began as a pastime for the three founders who were all members of the same church in Atlanta. They would meet on—of course—Monday nights, not to watch football, but to taste each other’s latest brews and revel in the camaraderie.
“We were all white-collar dudes doing our day jobs,” said co-founder Joel Iverson, “but always pointing to what we’d be brewing come Monday night. Instead of dreading Mondays, we actively looked forward to them.”
But after opening the “West Midtown” brewhouse in 2011, their hobby and passion quickly transformed into a major business enterprise with all the pressures and complications that accompany rapid growth. The focus inevitably turned to making “big batches of beer and improving our efficiencies,” said Iverson. Business success certainly has its satisfactions, but the founding trio found themselves drifting away from their original intent: To foster fun, innovation, and, above all, “deepening human relationships over some of the best beer in the country.”
Thus, The Garage is in many ways a return to the founding spirit of Monday Night Brewing, Iverson explained. Built along one of the country’s largest urban-renewal projects, the new Westside Beltline trail, it features a public tasting room with a patio for touring guests, plus an adjacent “urban orchard” for brewing beers the old-fashioned way, using wild fermentation. Most important of all, there’s simply more room under roof.
“We have all this additional space for multiple barrel-aging and souring rooms to experiment with the sort of specialty beers that have won us so many awards,” said Iverson. “Originally, the idea seemed a little crazy, but viewed within the context of our main mission, it clearly was a step we had to take.”