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Water Heaters

Why Marana's Hard Water is Destroying Your Water Heater (And How to Fix It)

Andrew M Dobbins
March 20, 2026
2 min read

If you live in Marana, you're likely familiar with the white crust that forms on your showerheads and faucets. That's calcium and magnesium from our notoriously hard water. But while it's an annoyance on your fixtures, it's an absolute disaster for your water heater.

The Hidden Damage of Marana Water

Marana's water supply comes heavily from groundwater aquifers, resulting in water hardness levels that often exceed 15 grains per gallon (gpg)—which is classified as 'extremely hard.' When this water is heated inside your water heater tank, the minerals separate and fall to the bottom, creating a thick layer of sediment.

Over time, this sediment:

  • Blocks the heat source: Your burner has to heat the rock-hard sediment before it can heat your water, driving up your energy bills.
  • Overheats the tank: The trapped heat at the bottom of the tank causes the metal to weaken, eventually leading to a catastrophic burst.
  • Reduces capacity: A 50-gallon tank might only hold 35 gallons of water if there's 15 gallons of rock at the bottom.
  • Destroys heating elements: In electric water heaters, the lower element gets buried in sediment and burns out prematurely.

The Solution for Marana Homeowners

To protect your investment, we recommend a two-step approach:

  1. Annual Flushing: Your water heater must be flushed at least once a year. In Marana, we often recommend twice a year for homes without water treatment. This removes the loose sediment before it hardens into rock.

  2. Water Softening: The ultimate solution is installing a whole-house water softener. By removing the minerals before they enter the water heater, you eliminate the problem entirely. A water softener will literally double the lifespan of your water heater in Marana.

Tankless Water Heaters and Hard Water

If you have a tankless water heater, hard water is even more dangerous. The minerals scale up the narrow heat exchangers, causing the unit to overwork and fail. Tankless units in Marana must be descaled annually with a specialized vinegar solution, and we strongly advise against installing a tankless unit without a water softener in front of it.

Don't wait for your water heater to burst. Call Wood's Plumbing at (520) 682-2233 to schedule a professional flush or discuss water treatment options tailored specifically for Marana's water conditions.

Frequently Asked Questions About Water Heaters

How long do water heaters last?

Traditional tank water heaters last 8-12 years, while tankless water heaters can last 20+ years with proper maintenance. Regular maintenance extends lifespan significantly.

Should I repair or replace my water heater?

Consider replacement if your water heater is over 10 years old, needs frequent repairs, produces rusty water, makes unusual noises, or if repair costs exceed 50% of replacement cost.

What size water heater do I need?

Water heater size depends on household size and usage. A family of 4 typically needs a 50-gallon tank or a tankless unit rated for 8+ GPM. A professional can assess your specific needs.

Need Professional Plumbing Help?

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