Storage tank water heaters: dependable and familiar

Tank units store heated water and deliver it quickly. They’re often simpler to install, and replacement can be straightforward if you’re swapping like-for-like. Many homeowners pick a tank heater for predictable performance and lower upfront cost.

Tankless water heaters: long service life and space savings

Tankless units heat water as you need it. They can save space and can last longer with proper care. As a rule of thumb, tank water heaters often last 8–12 years, while tankless units commonly last 15–20+ years (maintenance matters). (rheem.com)

Hardness is often measured in “grains per gallon” (gpg). One gpg equals about 17.12 mg/L as calcium carbonate. (pubs.usgs.gov)

Relief valves aren’t meant to “manage” thermal expansion. Plumbing codes note the relief valve should not be used as a means of controlling thermal expansion. (codes.iccsafe.org)

Eagle has a plumbing permit application that lists water heaters. If you’re replacing or installing, it’s smart to confirm permit requirements for your exact project scope and address. (cityofeagle.org)

Step 1: Identify your “peak hour” reality

Think about the busiest hot-water window: two showers back-to-back, dishwasher, laundry, kids’ bath time. A unit that feels fine on a quiet weekday can struggle on a Saturday morning.

Step 2: Match the heater to the home (not the old label)

Replacing a failed water heater with the same size is common—but not always correct. A remodel, additional bathroom, growing family, or even a new soaking tub can change demand. A pro assessment helps avoid undersizing (cold showers) and oversizing (wasted energy).

Step 3: Account for hard water maintenance from day one

In very hard water areas, preventive care is not “extra”—it’s a strategy to protect the investment. Many homeowners pair water heaters with a water softening system or plan routine flushing/descaling to keep performance consistent.

Step 4: Don’t skip thermal expansion protection when it applies

Many modern homes effectively have “closed” water systems due to check valves, pressure-reducing valves, or backflow prevention. In those cases, model plumbing code language requires a thermal expansion control device, installed and sized per manufacturer instructions. (codes.iccsafe.org)

Step 5: Confirm permit requirements for Eagle installations

Installation quality matters, but so does doing the job the right way administratively. The City of Eagle provides a plumbing permit application that includes water heaters—your plumber can help determine what’s required for your specific install and inspection path. (cityofeagle.org)

1) “It still heats, but it’s getting loud.”
Popping or rumbling can be a sign of scale buildup in the tank. That’s a red flag to schedule service before a leak becomes an emergency.

2) “We ran out of hot water faster after remodeling.”
A bigger shower, additional fixtures, or a growing household can push an older sizing choice past its limit.

3) “We’re worried about damage if it leaks.”
That concern is valid—especially if the unit is in a garage, utility closet, or near finished spaces. A proactive replacement plan (before end-of-life) is often less stressful than an emergency swap.

How do I know if I should repair or replace my water heater?

Age is a big indicator. Many tank units are near end-of-life around the 8–12 year mark, while tankless units can often run 15–20+ years with maintenance. If you’re seeing rusty water, recurring leaks, or inconsistent temperatures, replacement is often the safer long-term call. (rheem.com)

Is a thermal expansion tank required for my new water heater?

It depends on whether your plumbing system is “closed” (often due to a check valve, pressure-reducing valve, or backflow preventer). Model code language requires a thermal expansion control device in those situations, installed downstream of those devices and sized per manufacturer instructions. (codes.iccsafe.org)

Does Eagle, ID have hard water—and does it matter for water heaters?

Eagle water hardness can be significant; the Town of Eagle notes an average around 14 gpg (“very hard”). Hard water can build scale inside water heaters and reduce efficiency, so maintenance and/or water treatment becomes more important. (townofeagle.org)

What size water heater should I install?

Size depends on household size, number of bathrooms, and peak-time usage. A plumber typically reviews fixtures, incoming water temperature, and usage patterns to recommend the right capacity (or tankless flow rate) so you don’t pay for capacity you don’t use—or run short during busy mornings.

Do I need a permit to replace a water heater in Eagle?

Permit requirements can vary by municipality and scope, but the City of Eagle provides a plumbing permit application that includes water heaters. Your licensed plumber can confirm what’s required for your specific address and installation details. (cityofeagle.org)

Grains per gallon (gpg): A common unit used to describe water hardness. One gpg is equivalent to about 17.12 mg/L as calcium carbonate hardness. (pubs.usgs.gov)

Thermal expansion: When water heats up, it expands. In a closed plumbing system, that expansion can increase pressure unless controlled. (codes.iccsafe.org)

Thermal expansion tank (expansion control device): A device installed on the cold water line (in applicable closed systems) that helps manage pressure increases created by thermal expansion. (codes.iccsafe.org)

Looking for related services? Explore Water Softening Systems and Plumbing Services.