Hot water is one of those things you only notice when it runs out. If you’re replacing an aging unit—or just curious about your options—you’ve probably wondered whether to stick with a traditional tank or make the switch to tankless.
At Peterson Salt, we install both. Here’s what you need to know to make the right call for your home.
How a Traditional Tank Water Heater Works
A storage tank water heater keeps a large supply of water—usually 40 to 80 gallons—heated and ready to go at all times. When you turn on the hot tap, pre-heated water flows out of the tank and cold water refills it from the bottom.
Common tank water heater features:
- Available in gas or electric
- Lower upfront cost
- Straightforward installation
- Works well for high-demand households
- Familiar technology with easy repairs
How a Tankless Water Heater Works
A tankless (or on-demand) water heater heats water only when you need it. Cold water passes through a heating element or burner as you use it—no storage required.
Common tankless water heater features:
- Available in gas or electric
- Heats water as you use it
- Compact, wall-mounted design
- No standby heat loss
- Longer average lifespan
Tank vs. Tankless: A Side-by-Side Look
Here’s how the two systems compare across the factors that matter most to homeowners:
Upfront Cost Tank heaters cost less to buy and install. Tankless units have a higher initial investment—but that gap often closes over time through energy savings.
Energy Efficiency Tank heaters keep water warm around the clock, even when no one’s home. Tankless units only fire up when you need hot water, which can reduce energy use by 20–30% in many homes.
Hot Water Supply Tank heaters can run out during high-demand periods—back-to-back showers, laundry, and dishwasher all running at once. Tankless units provide a continuous flow of hot water, though very high simultaneous demand may require a larger unit or a second unit.
Lifespan A well-maintained tank heater typically lasts 8–12 years. Tankless units often last 15–20 years with proper care.
Space Tank heaters require dedicated floor space in a utility room or basement. Tankless units mount to the wall and take up very little room.
Maintenance Both systems benefit from annual maintenance. In Minnesota, where water hardness averages 16–18 grains per gallon, mineral buildup is a real concern for both types—which is where a water softener makes a significant difference.
Which System Is Right for You?
There’s no one-size-fits-all answer, but here are some helpful guidelines:
A tank water heater may be the better fit if:
- You want a lower upfront cost
- Your household has predictable, moderate hot water use
- You’re replacing an existing tank and want a straightforward swap
- Budget is the primary concern right now
A tankless water heater may be the better fit if:
- You want long-term energy savings
- You’re renovating or have space constraints
- You want a unit that lasts longer before replacement
- Your household has variable hot water demand throughout the day
One Thing Both Systems Have in Common: Hard Water Is Their Enemy
Whether you go tank or tankless, Minnesota’s hard water will take a toll over time. Minerals build up inside the tank, coat heating elements, and clog the narrow passages inside tankless heat exchangers.
Hard water effects on water heaters:
- Sediment accumulation at the bottom of tanks
- Scale coating on heating elements reduces efficiency
- Increased energy use to reach target temperatures
- Shortened equipment lifespan
- More frequent repairs and maintenance calls
A water softener paired with either system is one of the best investments you can make. Softened water keeps your heater running efficiently and extends its life by years.
Peterson Water Treatment Installs Both
Our team installs gas, electric, tank, and tankless systems across the Twin Cities. We size the unit to your home, handle all connections and venting to Minnesota code, and haul away the old unit so you start fresh.
We also offer water softener installation and testing so your new water heater gets the clean, soft water it needs to last.