How Much Does It Cost to Replace a Water Heater?

How much does it cost to replace a water heater? In 2026, most Central Illinois homeowners pay $1,400 to $2,500 installed for a standard 40 to 50 gallon tank, and $3,500 to $5,500 installed for a tankless unit, per the U.S. Department of Energy.

Most water heaters give you warning before they quit. Watch for these symptoms:

• Rusty or discolored hot water, especially after the cold side runs clear.
• Rumbling or popping from the tank when it heats. That is sediment baked onto the burner.
• Water pooling under the tank or rust streaks on the jacket.
• Lukewarm showers that used to be hot, or running out of hot water faster than last year.
• Age over 10 years on a tank unit, or over 15 on a tankless.

If you are seeing two or more, walk through our guide on the 5 signs you need a new water heater before you spend money on another repair.

The sticker on the tank is only part of the price. Five things move the final number up or down:

• Fuel type. Gas units cost more than electric upfront but are cheaper to run in Illinois. Heat pump units cost the most upfront but use the least energy.
• Tank size. A 40 gallon is cheaper than a 50, and a 75 gallon power-vent jumps the price hard.
• Venting and code. Older homes often need a new T&P discharge, expansion tank, sediment trap, drain pan, or updated vent to meet current code.
• Access. A tight closet, an attic install, or a basement with narrow stairs adds labor.
• Switching types. Going tank to tankless means new gas line sizing and a new vent. That work is real, and it shows up on the invoice.

Still deciding which way to go? Our tank vs. tankless water heater guide walks through the trade-offs in plain English.

Match the unit to the problem, not the other way around:

• Standard gas tank (40 to 50 gal): Best for most 2 to 4 person homes. Reliable, familiar, easy to service.
• Electric tank (40 to 50 gal): Best when there is no gas line or you want a simpler install.
• Power-vent gas tank: Best when the existing flue cannot be reused or you need to vent horizontally.
• Tankless (gas): Best for homes that run out of hot water, want endless showers, or need to free up floor space.
• Hybrid heat pump: Best for energy-focused homeowners with a warm utility space. Uses up to 60 percent less energy according to the ENERGY STAR program.

Our team installs all of these. See the full water heater installation service page for what is included.

Here is what a typical installed price looks like in Central Illinois right now:

• 40 gal electric tank: $1,400 to $2,200 installed.
• 40 to 50 gal atmospheric gas tank: $1,600 to $2,500 installed.
• 50 gal power-vent gas tank: $2,400 to $3,400 installed.
• Gas tankless (whole home): $3,500 to $5,500 installed.
• Hybrid heat pump (50 to 65 gal): $3,200 to $4,800 installed.

Common add-ons that affect the total: expansion tank ($150 to $300), new shutoff and flex connectors ($75 to $200), drain pan and condensate routing ($100 to $250), permit and inspection (varies by city), and haul-away of the old unit (usually included with a full replacement).

Want a quick gut-check before you call? If a quote comes in well under these ranges, ask what code items are missing. If it comes in well over, ask what is being added and why. A trustworthy plumber will walk you through it line by line.

Use the simple rule plumbers use: if the repair is more than 50 percent of replacement cost and the unit is past 8 years old, replace it. Tank leaks from the bottom are not repairable. Anode rods, thermocouples, igniters, and elements usually are. If you are not sure where the water is coming from, our how to tell if you have a water leak guide helps you narrow it down before the visit.

At Trouble Free Heating, Cooling & Plumbing, our licensed plumbers give you a clear flat-rate price before any work starts, pull permits when required, and bring the new unit, fittings, expansion tank, and drain pan with us so the job finishes the same day in most cases. We service and install every common brand and fuel type across the area.

We help homeowners in Pekin, Peoria, Morton, Washington, East Peoria, Canton, Tremont, and surrounding Central Illinois communities.

To keep your home trouble-free, give us a call at (309) 347-5309 or schedule water heater service today.

Schedule Water Heater Replacement

Common add-ons: expansion tank $150 to $300, new shutoff and flex connectors $75 to $200, drain pan and condensate routing $100 to $250, permit and inspection varies by city. Haul-away of the old unit is usually included with a full replacement.

A straight swap of a like-for-like tank unit takes most of a morning, usually 2 to 4 hours from shutoff to first hot shower, and finishes the same day. Add time when the job changes anything: a power vent conversion, an attic or crawl space location, a gas line resize for tankless, or code items the old install never had. A tank to tankless conversion is typically a full day because of new venting and gas sizing.

Cold Illinois groundwater in winter lowers a tankless unit's usable flow rate, so size up rather than down here. Undersizing is the most common reason a new unit still runs out of hot water.

Legally in Illinois, gas line work and venting fall under plumbing code and generally require a licensed plumber and a permit. Beyond the law, three things go wrong on do-it-yourself swaps: an improper T and P discharge, a vent that back-drafts combustion gases into the house, and a missing expansion tank on a closed system that later blows a fitting. The savings are not worth a carbon monoxide risk or a denied insurance claim on water damage.

Efficiency incentives change year to year, and utility programs in Central Illinois sometimes cover heat pump water heaters. Check the current list on our HVAC and plumbing rebates page before you buy, since the rebate usually has to be filed with the invoice.

Ranges help you plan. A firm number needs a look at your fuel type, venting, space, and what code requires in your city. Our licensed plumbers quote a flat installed price before any work starts, and a new water heater installation comes with a free estimate. We provide water heater replacement for homeowners in Pekin, Peoria, Morton, Washington, East Peoria, and Canton.

Call (309) 347-5309Get a Free Estimate