Tankless Water Heater Installation in Glendale, AZ
If your tankless runs hot, then cool, then hot again in the summer, the hot water gives out halfway through the second shower on a cold morning, or you are pricing a new unit for your Glendale home, you're on the right page. Water in the City of Glendale's system ranges nearly 50 degrees in the City's 2025 report, and a tankless unit has to be chosen and set for both ends of that range.
A unit here has to be picked against the water your house will actually see, which means reading the same model twice: once at the cold end of the City's range and once at the warm end. A model can pass one of those readings and fail the other, and the one it fails is the one you notice.
AZ ROC #150707
Licensed, Bonded & Insured
Navien Preferred
1-Year Workmanship Warranty
Tank-to-Tankless Conversions
Family-Owned, Christian
10% Off Water Heater Installs
Yearly Descale, Averaged
Tankless descaling averages about $250 a visit.Hours on the Calendar
Twelve-hour days, 7 to 7, every day but Sunday.Accepted Payment
Checks, cash, and Zelle. Cards are not accepted.Service-Call Savings
Calls that total $300 or less come in 10% lower.Ring-Back Time
Missed calls get a ring back, usually within 10 to 15 minutes.Senior and Veteran Pricing
Veterans and customers 55 and up pay 15% less; seniors, service members, and first responders, 10% less.AZ ROC #150707
Licensed, Bonded & Insured
Navien Preferred
1-Year Workmanship Warranty
Tank-to-Tankless Conversions
Family-Owned, Christian
10% Off Water Heater Installs
Yearly Descale, Averaged
Tankless descaling averages about $250 a visit.Hours on the Calendar
Twelve-hour days, 7 to 7, every day but Sunday.Accepted Payment
Checks, cash, and Zelle. Cards are not accepted.Service-Call Savings
Calls that total $300 or less come in 10% lower.Ring-Back Time
Missed calls get a ring back, usually within 10 to 15 minutes.Senior and Veteran Pricing
Veterans and customers 55 and up pay 15% less; seniors, service members, and first responders, 10% less.Glendale Water Runs From About 55°F to About 103°F
A tankless heater does one job: it raises the temperature of water as it flows through. How much it has to raise it depends on how warm the water is when it arrives, and in Glendale that changes a lot with the season.
What the City measured
The City of Glendale's 2025 water quality report lists tap water temperatures ranging from 12.9 to 39.7 degrees Celsius, with an average of 25.3 degrees Celsius. In Fahrenheit, that is about 55°F at the low end, 103°F at the high end, and 78°F on average.
Sized for the coldest water
To deliver water at 120°F from a 55°F supply, the unit must add about 65°F. Manufacturers publish how many gallons per minute a model can deliver at different temperature rises, and flow drops as the rise increases. We read that chart at the cold-end rise, then check it against the showers, sinks, and appliances your household runs at the same time. The yearly average, about 78°F, describes no particular season, so it plays no part in sizing. A unit chosen based on warm-weather numbers can come up short when the supply is at its coldest.
A Glendale sizing example
Glendale's own fixture ordinance caps a showerhead installed today at 2 gallons per minute and a kitchen faucet at 1.8. Two showers and the kitchen sink running together come to about 5.8 gallons per minute. The question for the unit is whether it can deliver that much water at a 65-degree rise, and a model's output at that rise can sit well below the headline figure on its box. Older showerheads that predate the ordinance can use more, so we look at what is actually on the wall.
Set up for the warmest water
At the end of the year, water arriving near 100°F requires very little additional heat. Every gas tankless burner has a lowest setting it can fire at. When a small draw needs less heat than that, the water can overshoot, or the burner can cut out and relight in a cycle that feels like a shower going hot, then cool. Model choice, the temperature setting, and how the unit handles low flow all matter here, and we set them with the warm months in mind.
Tankless Installs for Glendale Homes
What a conversion can add
Depending on the house, a conversion can involve a larger gas supply, new venting, a condensate drain for condensing models, and an outlet for the unit's controls and fan (a new outlet is an electrician's job). Our part of it is priced line by line before work begins.
When the gas line has to change
If the line feeding the new unit needs to be extended or upsized, the City of Glendale treats it as permit work and verifies the pipe size when the permit is applied for. Our Glendale gas line page goes into the City's gas rules in detail.
In homes built before 1978, we only take on work that leaves painted surfaces undisturbed. If a gas or vent route would need a painted wall opened, that part goes to a lead-safe certified contractor you hire directly; we do not perform or arrange it.
From Old Heater to a Unit Set for Both Seasons
What is there now, described
The starting point is whether you are replacing a tank or an older tankless unit, and where in the house it sits. Both answers change how much of the following work is plumbing and how much is placement.
Size at the cold-end rise
We work out the flow the house needs and pick a model that delivers it at the rise the coldest supply water calls for.
Plan the gas, vent, and mount
We check the gas supply, choose the location, and map the venting and condensate route before the quote is written.
Install
Any old tank comes out, the unit mounts, and the gas, water, vent, and electrical connections are made.
Set for warm water and hand over
We set the delivery temperature with a warm inlet in mind, try a low-flow draw at a sink, and show you the service valves used for descaling.
Serving Glendale From Our Phoenix Base
American Discount Plumbing is based in Phoenix and serves all of Glendale.
Tankless Trouble That Follows Glendale's Seasons
“In summer the shower goes hot, then lukewarm, then hot again. And the kitchen tap won't give warm water at a trickle in August.”
Both of these are August complaints, and both come from a burner that cannot turn down far enough for water that is already warm.
A thin stream of water arriving near 100 degrees asks for less heat than the burner's lowest setting, so the unit either stays off or fires and overshoots, and the shower swings while it does. A slightly larger draw settles many of them, and a setting change settles more. Where neither does, the model's minimum firing rate is the number to look at, and it is one of the two figures this page sizes against.
“On cold mornings we run out of hot water halfway through the second shower.”
Undersized for the cold end of the year.
Tanks and tankless units both work best with water that arrives at near 55 degrees. We size a replacement against that number.
“Our quote was based on the number of bathrooms.”
Flow at the cold-end rise sets the size.
Two homes with three bathrooms can use hot water in very different ways. What matters is how many fixtures run at once and how much each one draws, measured against what a model can deliver when it has to add 65 degrees.
How Pavel (Paul) Fits a Tankless Unit to Glendale Water
Glendale Tankless Questions, Cold Taps to Warm Ones
Still have a question? Call Pavel (Paul) directly and get a straight answer, no phone tree.
Not by itself. The wait depends on the length of pipe between the heater and the tap, and a tankless unit also takes a moment to fire. Putting the unit closer to the fixtures you use most is what shortens it.
Many homes do it yearly. With hardness in the City of Glendale's water varying by source, the right interval depends on what reaches your house and on any treatment before the unit. The visit runs a scale-dissolving flush through the heat exchanger, connected at the unit's service valves, then rinses it out.
The lowest setting that still feels comfortable at the shower. Because you then run the tap further to the hot side, more water passes through the unit, which helps the burner stay lit at small draws.
Possibly. The new total flow has to be checked against what your current unit delivers at a 65-degree rise. If it falls short, the options are a larger unit or a second one.
The report gives a range for the system as a whole. The water at your tap can run a little warmer or cooler, depending on how the pipe runs to the house. A kitchen thermometer under a cold tap on a winter morning tells you your own number.
The manufacturer's warranty depends on the brand and model, and our workmanship on the install is covered for one year.
Every Service in Glendale
Our other pages for Glendale, and the tankless page behind this one:
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Sizing a Tankless Unit in Glendale? Call American Discount Plumbing
Ring (602) 883-2787 and say how many showers run at once on a cold morning. The sizing starts from that sentence, and from the month you say it in.
Ask for a quote for both numbers: what the unit delivers at February's inlet temperature and what its burner does at August's.
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