When comparing a tankless vs tank water heater, the right choice depends on your budget, space, and hot water needs. A traditional tank is more affordable upfront and holds a ready supply of hot water. A tankless unit, like the Rinnai tankless water heater, costs more to install but provides endless hot water, saves space, and is far more energy-efficient.
- Traditional Tank: Lower upfront cost, standard technology, but can run out of hot water.
- Tankless: Higher upfront cost, endless hot water, 20+ year lifespan, saves space.
- Best for Cabins: Tankless (no standby energy loss when the cabin is empty).
- Best for Large Families: Tankless (endless back-to-back showers).
Table of Contents
- How a Traditional Tank Water Heater Works
- How a Tankless Water Heater Works
- Pros and Cons of Tankless Water Heaters vs. Tanks
- Which System is Right for Your Situation?
- The Importance of Water Softeners in Minnesota
- Frequently Asked Questions
How a Traditional Tank Water Heater Works
Most homes in Central Minnesota have a traditional tank water heater. These large cylinders (typically 40 or 50 gallons) heat water continuously and store it until you need it.
We install high-quality Bradford White water heaters because they are reliable and cost-effective. However, because they store hot water, they suffer from “standby heat loss”—energy is used to keep the water hot even when you aren’t home or sleeping. Once the tank is empty, you have to wait for it to reheat.
How a Tankless Water Heater Works
A tankless system (also called “on-demand”) does not store water. Instead, it uses high-powered gas burners to heat water instantly as it passes through the unit.
At Gilk Services, we specialize in Rinnai tankless water heater installations. When you turn on the hot tap, the Rinnai unit senses the flow and ignites, delivering hot water for as long as the tap is open. When you turn the tap off, the unit shuts down, using zero energy.
Pros and Cons of Tankless Water Heaters vs. Tanks
To help you decide, here is a quick comparison of the pros and cons of tankless water heaters versus traditional tanks.
| Feature | Traditional Tank (Bradford White) | Tankless (Rinnai) |
| Hot Water Supply | Limited (can run out) | Endless (as long as you have fuel) |
| Lifespan | 8–12 Years | 20+ Years |
| Size | Large (takes up floor space) | Small (wall-mounted) |
| Energy Efficiency | Good (but has standby loss) | Excellent (heats only on demand) |
| Upfront Cost | Lower | Higher |
| Instant Hot Water? | No (takes time to reach tap) | No (takes time to reach tap)* |
*Note: “Instant” hot water refers to a recirculation pump system, which can be added to both types, but tankless units heat the water endlessly once it arrives.
Which System is Right for Your Situation?
We often get asked which system is “better.” The answer depends entirely on how you use your home. Here are our recommendations for common scenarios in Richmond and Cold Spring.
Scenario 1: The Large Family
- Recommendation: Tankless (Rinnai)
- Why: If you have teenagers or a large family, morning showers can deplete a 50-gallon tank quickly. A tankless unit provides endless hot water, meaning you can take five showers back-to-back without the water ever turning cold.
Scenario 2: The Cabin or Lake Home
- Recommendation: Tankless
- Why: Cabins often sit empty for days or weeks. A traditional tank wastes money heating water no one is using. A tankless unit only uses energy when you are actually at the lake. Plus, they are much easier to winterize and take up less precious closet space.
Scenario 3: The Budget-Conscious Replacement
- Recommendation: Traditional Tank
- Why: If your current water heater failed unexpectedly and you need a quick, affordable solution, a standard tank is the way to go. Retrofitting a home for a tankless unit often requires upgrading gas lines and venting, which increases the initial cost.
The Importance of Water Softeners in Minnesota
Regardless of which unit you choose, the hard water in our area is a major factor. Hard water scale builds up faster in tankless units due to the high heat.
Expert Tip:
If you install a tankless water heater in Central Minnesota, you must have a functioning water softener. Without soft water, scale will destroy the heat exchanger in the tankless unit, leading to premature failure and voided warranties.
Frequently Asked Questions
Do tankless water heaters really provide instant hot water?
No. You still have to wait for the cold water to clear out of the pipes between the heater and your faucet. However, once the hot water arrives, it will never run out.
Is a Rinnai tankless water heater worth the extra cost?
For many homeowners, yes. While the installation is more expensive, the energy savings, space savings, and 20-year lifespan often make it a better long-term investment.
Can a tankless water heater handle a whole house?
Yes, provided it is sized correctly. We calculate your “flow rate” (how many showers/appliances run at once) to ensure we install a Rinnai unit powerful enough for your needs.
Do tankless water heaters work with electric or gas?
They exist for both, but gas models (propane or natural gas) are far more efficient and effective for whole-home heating in Minnesota’s climate.
What maintenance does a tankless heater need?
Tankless units need to be flushed once a year to remove mineral buildup, especially if your water is hard. We offer this as part of our maintenance programs.
Will a tankless heater save me money?
You will save money on your monthly energy bill (sometimes up to 40% on water heating costs), though it takes time to recoup the higher installation cost.
Upgrade Your Home Comfort with Gilk Services
Whether you need a reliable replacement tank or want to upgrade to the luxury of endless hot water, the team at Gilk Services is here to help. We can assess your gas lines, space, and water usage to recommend the perfect solution for your home or cabin.
Call us today at (320) 597-3200 for a free estimate on a new water heater installation.
By The Gilk Services Team
Last Updated: November 14, 2025
Gilk Services is a licensed plumbing contractor (License: PC644312) specializing in Bradford White and Rinnai water heater installations in Richmond, Cold Spring, and Paynesville, MN.