Restaurant owners should consider water heater redundancy. In restaurants, hot water is a non-negotiable. Your dishwasher needs to hit health code temperatures. Your cooks need hot water at every station. Your staff needs proper temperature water for handwashing…and your health inspector absolutely needs to see your hot water working correctly.
So, what do you do when your water heater goes down in the middle of a dinner rush? In most cases, the answer is you close. Not because you want to, but because you have to. A redundant water heater system makes the difference between a brief inconvenience and a lost night of revenue (something no one in the restaurant industry wants to face).
Restaurants Can’t Afford a Hot Water Failure
A kitchen has to close when there is no hot water, unless you have a hot water system that isn’t built around a single point of failure.
Unlike your ice machine or your fryer going down, there’s no workaround when your water heater calls it quits. The health code in most states requires hot water at specific temperatures throughout the kitchen. It’s a must for handwashing, dishwashing, and food prep.
Commercial dishwashers require water between 120–140°F for washing and 180°F for the sanitizing rinse (in high-temp units). If the water heater can’t deliver, the dishwasher fails the inspection. If you have no functioning dishwasher, you have no clean dishes, and you can’t reach for paper plates. You definitely have to close down for health code reasons.
Similarly, handwashing stations must have water at a minimum temperature of 100°F at the faucet, again, per the health code. The law requires that kitchen employees wash their hands frequently. There’s no substitution, and hand sanitizer can’t do the job.
So, bare minimum, if your water heater fails during service, you can’t get a repair, you have to make the decision to close….and as every restaurant owner knows, the cost of closing is very high. You lose revenue for the night and potentially even a weekend if the repair takes some time. In the meantime, you risk reputation damage (especially if you serve a strong weekend volume). Worst case, you could end up with a health code violation on record, and in this cutthroat industry, it’s something no restaurant can afford.
What Redundancy Means for a Restaurant
Restaurant owners know most aspects of their equipment in and out, so while it may be redundant to discuss redundancy, let’s break it down in plain English. (Check out this post for a more thorough breakdown.)
Redundancy means your establishment has the backup water heater capacity, so if one unit fails, the other can pick up the slack right away. It sounds simple and maybe even a bit overly cautious, right? But the goal here isn’t to have a spare commercial water heating unit languishing unused in the corner, waiting for its moment to shine. It’s to have your system configured in such a way that the failure of one unit doesn’t mean a total failure of your restaurant.
The question for restaurant decision makers becomes not “Do I have a backup?” but rather, “Does my backup have enough capacity to keep my kitchen up and running during service?”
How much do you need? 50% redundancy might be enough to limp through a light service and keep your doors open. But under peak demand, when you’re in the weeds, it’s likely not enough. For dependability, you need full redundancy. That means a backup that covers 100% of your peak demand. Backup that covers just enough to stay open at reduced capacity may help you through a shift, but like a spare tire, it’s not going to support you for the long haul.
The Unique Hot Water Demands of a Restaurant
Presumably, your cooks know how to boil water, so do you really need that much in a restaurant? Here’s why your hot water goes so fast: your commercial dishwasher.
Your dishwasher is almost always your biggest hot water draw. High-temperature dishwashers require a 180°F sanitizing rinse. That makes commercial dishwashers the most demanding single piece of equipment. If the water temperature drops, your high-temp machine won’t sanitize properly—it becomes a health code and safety issue, not just an inconvenience.
While low-temperature machines use chemical sanitizers to clean, they still have to have a consistent wash temperature. During busy service times, dishwashers run constantly, and that means the demand is high and sustained.
The hot water isn’t for dishwashing alone, though. The health code requires 100°F at the faucets for handwashing stations. So, if you have multiple stations in a busy kitchen and all restrooms simultaneously drawing hot water during a rush, you can quite easily run low on capacity. It’s not so much that it’s a major hot water user, but that it’s one of the most commonly overlooked areas in capacity planning.
In food prep, hot water is still essential. Thawing food with running hot water, blanching, and most cleaning applications use hot water. The capacity issue comes in when prep demands get higher right before service, when they can overlap with your dishwasher startup.
Then there’s your bar and hot water. You need it for glass washing, ice bin sanitation, handwashing, and more. While some establishments run their bar hot water on a separate zone, it’s worth checking to make sure your water heating system is adequately sized to cover the bar.
The planning mistakes come in when you’re sizing for each use case individually. You may have plenty of hot water to run each area on its own, but what happens when there’s a simultaneous demand? Without enough hot water, you can reach a critical failure of one or multiple functions in your establishment.
One of the best ways to measure your need is to look at total peak demand. During your busiest moments (like that Friday dinner rush), if your dishwasher is running constantly, all handwashing stations are active, and prep is still happening, can your system keep up?
Do You Need Water Heater Redundancy (and How Much)?
The truth is that not every restaurant needs full water heater redundancy. But most restaurants serving dinner do. So, is your restaurant a candidate?
There are several factors that make the case for redundancy:
- High dinner volume, especially during your peak weekends.
- A full-service kitchen (not counter service or a limited menu).
- Bar program that’s on the same water heating zone as your kitchen.
- Banquet, catering, and event spaces where you can run into sudden high-volume demand.
- If you’re relying on older equipment that’s more likely to fail (water heating or even dishwashing equipment).
- If you have a single water heater serving your entire operation.
How do you figure out your true peak hourly hot water demand (in other words, your gallons per hour)? You need to look at each of these areas at their max, and ask yourself if your current system can deliver a steady stream of hot water to cover a full 4-hour dinner service when everything is at peak.
If one unit failed right now, today, would you have backup capacity, and what would it be? If your answer is zero, you don’t have enough redundancy.
There are a few telltale signs that your water heating system is undersized or at risk. If your water heater temperature tends to drop late in service, or if your staff reports inconsistency at the handwashing stations, it’s a sign you’re vulnerable.
Also, look at the performance of your biggest water user—your dishwasher. If your equipment runs slower or fails temperature checks during busy periods, that’s a strong case for needing a redundant system. If you’ve added additional hours to your service schedule or if you didn’t assess your water heater capacity when you added a bar program, it’s probably time to recalculate your water heating needs.
Water Heater Redundancy Configurations That Work for Restaurants
Restaurants have several options for redundancy. The best way to decide is to discuss it with your water heating professional (give RWS a call today—we can help).
Option 1: Two Matched Units Sized Together
The first option is to get two matched units that are sized so that either one could carry the minimum service demand on its own. Then you balance your system between both. That keeps both of your water heater units active and sharing a load, so you reduce wear and tear on individual units.
If and when one water heating unit fails, the other is right there to pick up the slack while you arrange repair. This is often the smart, safe approach for most mid-sized restaurants with predictable volume.
Option 2: A Primary Unit and Smaller Backup
Choosing to have a smaller backup water heating unit can be a less expensive approach—good for smaller operations or those who face budgetary constraints, where two full units are cost-prohibitive.
The primary water heating unit covers your regular demand, but then you have a smaller backup that kicks in if your primary unit fails or if you’re in peak overflow. This offers you partial redundancy—just enough hot water to keep your dishwasher and handwashing stations running up to code. It might not fully cover 100% of the peak, but it will buy you time to call for repair without completely shutting down service.
There are other options, like adding a tankless or hybrid unit, but those come with drawbacks. Tankless units can supplement capacity but aren’t a true failover solution on their own. As always, the best advice will come from a water heating specialist.
Your water heating professional will look at your current peak demand (GPH) and the physical space available in the boiler room or utility area. From there, they will make recommendations. When it comes to commercial water heaters, rental plans make more sense than a capital purchase for the backup equipment.
Maintaining Redundant Water Heaters
Redundancy doesn’t mean set it and forget it. Your backup only works if you can depend on it and you know it’s operational.
When you have redundancy, you’re generally quite safe. Failure typically happens because the backup unit has quietly taken over for the primary unit’s failure, and no one notices until that backup unit also fails. This is especially dangerous for restaurants, because kitchen staff are so busy that they’re not monitoring water heater performance.
To mitigate the risk, it’s a good idea to add a water heating system check to your regular maintenance schedule. Whether it falls under your responsibility or you’re able to assign it to a kitchen manager or facilities contact, a quick visual check should be on your to-do list.
The person assigned to check the system should be familiar with the normal operation of your system. That way, they catch concerns early, when intervention can make the biggest difference.
Proactive service might be included in part of your rental plan. This makes it easy because you don’t have to be as diligent in catching problems yourself.
A Friday Night Without Hot Water? Rely on Us!
What does it look like when your water heater fails? Let’s paint the picture. It’s 6 pm on a Friday night (your busiest time), and the water heater goes down. If you don’t have redundancy, you can expect the dishwasher to fall below the regulated temperature within the first hour.
Health code compliance means you have to shut down the dishwasher. Plates, glasses, pots, pile up. You quickly blow through all of your service wear. When you’re out of dishes, your kitchen grinds to a complete halt. You likely have to close.
The results of closing on a Friday are already a lot to bear, but be sure to figure in lost covers and comped meals for those patrons you’ve already seated (who WILL leave angry reviews about their experience).
Since it’s going into the weekend, emergency repair may take longer or be more costly. Even with our 24/7 emergency response, you’ll still lose time that you can’t get back.
The picture is very different when compared to a system that includes a redundant system. With an auxiliary water heater, there is no hot water emergency. The backup simply kicks in, service continues, and you can schedule a repair. It’s a huge difference.
Restaurants operate on very thin margins (as you likely know). Even a single bad night caused by a preventable equipment failure can be a big hit. That’s why hot water heater redundancy is one of the highest-ROI infrastructure choices you can make. The cost of downtime is almost always higher than the cost of a backup system.
Don’t play water roulette, hoping a water heater failure never happens. Take the proactive approach. At Reliable Water Services, we work with restaurants throughout Wisconsin, Indiana, and the Upper Midwest to help you get the peace of mind you deserve.
We’ll assess your hot water demand and design your best water heater redundancy options. The benefit is that there’s little to no upfront equipment cost to worry about. You depend on 24/7 emergency service and can expect fast replacements should something go wrong.
Stop losing sleep over the “worst case scenario” and call today for a free assessment. We’re here to help you access the hot water you need to make delicious food.