Tankless vs. Tank Water Heaters: Pros and Cons for Homeowners

When it’s time to replace your water heater, most homeowners face a common question: Should I choose a traditional tank water heater or go with a tankless model? Both options can provide reliable hot water, but they work very differently and come with unique advantages and drawbacks. Here’s what you need to know before making your decision.

Tank Water Heaters

Tank water heaters store and heat 30–80 gallons of water in a tank, keeping it hot and ready for use around the clock.

Pros

• Lower upfront cost – Generally more affordable to purchase and install.
• Simpler installation – Fits into existing hookups in most homes.
• Reliable supply – Provides a steady flow of hot water until the tank runs out.
• Easier to service – Repairs are usually simpler and less expensive.

Cons

• Limited supply – Once the tank empties, you must wait for it to reheat.
• Higher energy costs – Constantly heats water, even when you’re not using it.
• Shorter lifespan – Usually 8–12 years, depending on maintenance.
• Takes up space – Large footprint, which can be an issue in smaller homes.

Tankless Water Heaters

Tankless, or “on-demand,” water heaters heat water only when you turn on the tap, using gas or electricity.

Pros

• Endless hot water – Never run out during showers or laundry.
• Energy efficient – Only heats water when you need it, lowering utility bills.
• Compact size – Mounts on a wall and frees up floor space.
• Long lifespan – Typically lasts 15–20 years with proper maintenance.

Cons

• Higher upfront cost – More expensive to purchase and install.
• Installation upgrades – May require new gas lines, venting, or electrical work.
• Limited flow rate – Running multiple fixtures at once can reduce hot water output.
• Maintenance needs – Annual descaling or flushing is recommended, especially in hard-water areas.

Which Is Right for You?

• Choose a tank water heater if you’re on a tighter budget, have modest hot water needs, or want the simplest replacement option.
• Consider a tankless water heater if you value energy efficiency, want unlimited hot water, and plan to stay in your home long enough to benefit from the long lifespan and utility savings.

Bottom Line

Both tank and tankless water heaters can be smart choices—it all depends on your household’s size, usage habits, and budget. Contact Summers & Zim’s to help evaluate your current setup and recommend the best option for your home.