When several people are showering, running the dishwasher, and doing laundry in the same morning, a 50-gallon tank can disappear faster than anyone expects. If the last person to shower keeps getting cold water, a tankless water heater is worth a serious look.
Our technician walks through how tankless heating actually works, including the one tradeoff homeowners should understand before making a decision.
Is a Tankless Water Heater Worth It?
For most households dealing with hot water shortages, yes. A tankless unit heats water as it flows through the system rather than drawing from a stored supply, which means the household doesn’t wait for a tank to recover. As our technician puts it, “there is no more running out of 50 gallons of hot water.” As long as the fixture is running, hot water keeps flowing.
How Does a Tankless Unit Compare to a Tank Water Heater?
A tank water heater stores a fixed supply—typically 40 to 50 gallons—and keeps it heated until it’s gone. Once depleted, the household waits for the tank to recover. A tankless unit skips the storage entirely, raising incoming water to the desired temperature as it passes through. The tradeoff is flow rate: because the unit is heating on demand, colder incoming water requires more work, which can reduce how much hot water it delivers at one time.
Does Cold Incoming Water Affect Flow Output?
It does. As our technician explains, “the colder the water coming into the tankless, the lower the flow output you get.” This matters most in climates where groundwater temperatures drop significantly in winter—Castle Rock included. It’s an important factor when sizing a tankless system and comparing it against a traditional tank.
Can Rock Plumbing, Heating, Air & Electrical Service Both Tank and Tankless Water Heaters?
Yes. We service most makes and models of both tank and tankless water heaters, including sidearm units connected to boilers. Our technicians train on new equipment as it comes to market, so we can handle what we encounter in the field. Every job is backed by our 100% satisfaction guarantee.
If you have a question this video doesn’t cover, call us at (720) 410-5239 and we’ll talk through your system and options.