Buying a new water heater is a big decision for your wallet and your comfort. Whether your old unit is leaking or you just want lower energy bills, knowing the true cost to replace a water heater is the first step.
The biggest question we get at Cardinal Plumbing is: “What is the real cost to replace a water heater, and is tankless worth it?”
In this guide, we break down the prices for Alton and Edwardsville homeowners so you can compare tankless water heater options vs. standard tanks without the guesswork.
Quick Comparison: Tank vs Tankless Cheat Sheet
Don’t have time to read everything? Here is the quick difference between the two systems.
| Feature | Standard Tank Water Heater | Tankless Water Heater |
| Installed Cost | $1,200 – $2,500 | $2,800 – $4,500+ |
| Lifespan | 8 – 12 Years | 20+ Years |
| Hot Water Supply | Runs out after 3-4 showers | Endless (Never runs out) |
| Energy Savings | Standard (Wastes energy 24/7) | High (Heats only when needed) |
| Space Required | Takes up floor space | Mounts on the wall |
1. The Cost to Replace a Standard Tank
For most homes, replacing your old tank with a new one is the fastest and most affordable option.
- 40 Gallon Water Heater Installation Cost: In our area, a standard 40-gallon gas or electric unit typically costs between $1,200 and $2,500. This price includes the new unit, all parts, and the labor to install it safely.
- Water Heater Replacement Cost 50 Gallon: If you have a larger family, you might need a 50-gallon tank. These run slightly higher but give you more hot water for back-to-back showers.
- 75 Gallon Water Heater Installation Cost: For luxury homes with big soaking tubs, you may need a massive 75-gallon tank. These are commercial-grade units and can cost over $3,500 due to their heavy weight and complex venting.
Need a quote? Check out ourTank Water Heater Servicespage.
2. The Cost to Upgrade to Tankless
Going tankless is a bigger investment upfront, but it pays off over time.
- Total Cost: A complete tankless water heater installation usually ranges from $2,800 to $4,500+.
- Why is it more? This price isn’t just for the unit. It covers the labor cost to replace gas water heater lines (which often need to be bigger) and installing special PVC venting through your wall or roof.
- The Payoff: You get a system that lasts 20+ years and cuts your water heating bill by up to 40%.
Learn more: Visit ourTankless Water Heater Servicespage.
3. “Big Box” Store vs. Professional Plumber
You might search for the Home Depot water heater installation cost and see a lower sticker price. But be careful—that price is often misleading.
- The “Basic” Trap: Their advertised price usually covers only “basic” labor. It rarely includes permits, expansion tanks, code upgrades, or hauling away your old heavy tank.
- Quality Check: The heaters sold in box stores are often “Retail Grade” with plastic parts. Cardinal Plumbing installs “Professional Grade” units (like Bradford White) that are built to last.
- Who do you call? If a store-bought heater breaks, you have to call a 1-800 number. If our heater breaks, you call us, and we fix it.
Is It Worth The Money? (Do The Math)
If you use a cost to replace water heater calculator, the math is simple:
- Tank: Cheaper today, but costs more to run every month. Dies in ~10 years.
- Tankless: Costs more today, but saves money monthly. Lasts ~20 years.
If you plan to stay in your home for more than 5 years, tankless is often the smarter financial move.
- Read Guide: Efficient Water Heating Solutions
Frequently Asked Questions (FAQ)
1. How much is the labor cost to replace a gas water heater?
Labor costs depend on how hard the job is. Replacing a tank in an open garage is cheaper than replacing a leaking unit in a tight attic. A professional quote from us includes the water heater cost, parts, labor, and disposal in one flat price so you never worry about hourly overages.
2. Can I replace my 40-gallon tank with a tankless one?
Yes! This is our most popular upgrade. We remove your bulky tank and mount a sleek tankless unit on the wall. It frees up storage space and gives you endless hot water.
3. Are there tax credits for 2025?
Yes. The federal government offers tax credits of up to $600 for high-efficiency gas tankless heaters. Ask us which models qualify!
4. How often should I service my water heater?
- Tanks: Flush them once a year to remove sediment.
- Tankless: Descale them once a year to keep the pipes clean.
- DIY Tips: Read our Water Heater Maintenance Guide.
Ready for Hot Water?
Don’t wait for a cold shower to ruin your morning. Whether you need a standard tank or a high-efficiency upgrade, trust the Water Heater Company Alton IL relies on.
👉 Contact Cardinal Plumbing Today for a free estimate!