Water Heater Installation in St. Louis

Tank & Tankless Water Heater Installation & Replacement for St. Louis Homeowners

Dunn Plumbing, Heating & Air Conditioning, LLC has been installing and replacing water heaters across the St. Louis area since 2003. We install tank water heaters, tankless water heaters, and expansion tanks, and every installation comes with a free estimate and a written 100% satisfaction and money-back guarantee. If you’re not satisfied with the work, we can resolve the issue or refund your money, no questions asked. We’re available 24/7 for emergencies and can schedule same-day appointments for most services.

Call (314) 476-9606 to schedule a free estimate on water heater installation or replacement in St. Louis. We’re available 24/7 for emergencies.

Why St. Louis Homeowners Call Dunn Plumbing, Heating & Air Conditioning, LLC

A failed water heater puts you in a tough spot, and the last thing you need is a contractor pushing an expensive replacement before they’ve even looked at the unit. When we arrive, we examine your existing system first to determine whether repair or replacement is actually the right call. We won’t recommend a new unit if yours can be fixed.

If another contractor has told you the equipment needs to be condemned, we offer free second opinions. Our fully stocked trucks arrive ready to work, and all installations are backed by the written money-back guarantee.

The full case for calling us:

• Free estimates on all new equipment installations
• Free second opinions on condemned equipment
• Written 100% satisfaction and money-back guarantee on all work
• 24/7 emergency availability with same-day appointments for most services
• Financing, payment plans, and coupons available
• St. Louis City and St. Louis County certifications maintained since 2003

Tank vs. Tankless: Which System Is Right for Your Home?

Tank and tankless water heaters suit different households. We walk through your water usage before recommending anything, so you end up with a system matched to your actual demand and budget.

Tank Water Heaters

Storage tank water heaters hold preheated water in tanks that commonly range from 30 to 80 gallons and handle simultaneous demand from multiple fixtures. Upfront cost is lower than tankless, and they’re well-suited to busy households. Gas models typically last 8 to 12 years; electric models run 10 to 15 years. When a tank water heater fails, replacement is usually straightforward.

Tankless Water Heaters

Tankless systems heat water on demand rather than storing it, which reduces standby energy loss. They’re more efficient and can last up to 20 years, though the upfront cost is higher. Gas-fueled tankless units are generally simpler to install. Electric models sometimes require an electrical service upgrade depending on your home’s current capacity.

Expansion Tanks

Homes on closed plumbing systems can experience pressure fluctuations that stress the water heater over time. In those cases, an expansion tank is installed alongside the water heater to manage that pressure. We’ll identify whether your system requires one during the estimate visit.

Signs Your Water Heater Needs Replacement

Water heaters don’t always fail all at once. These are the warning signs worth acting on before a small problem becomes an emergency:

• No hot water or inconsistent water temperature
• Rust-colored or discolored water at the tap
• Visible leaks or water pooling around the base of the unit
• Popping or rumbling sounds from the tank
• A unit that is 10 or more years old

St. Louis has documented hard water, and mineral sediment accumulates at the bottom of tank units over time. That buildup reduces heating efficiency, lowers hot water capacity, and causes the knocking sounds many homeowners notice first. If your unit is showing more than one of these signs, replacement is often more cost-effective than continued repairs.

Missouri also requires a permit for water heater replacement. As a licensed contractor holding St. Louis City and County certifications, we handle permitting and inspection compliance on every job so you don’t carry that risk.

What to Expect During a Water Heater Installation with Dunn Plumbing, Heating & Air Conditioning, LLC

The process is straightforward, and there are no surprises. Here’s how a typical water heater replacement visit works:

• Free estimate provided before any work begins
• On-site assessment of the existing unit to confirm whether repair or replacement is the right decision
• Unit selection discussion based on your household’s water demand, fuel type, and available space
• Installation including shutoff, draining and removal of the old unit, proper connections and safety valves on the new unit, and a full leak and operation test
• Old equipment disposal handled by our team
• Post-installation review with you before we leave

All work is backed by the written 100% satisfaction and money-back guarantee. Same-day appointments are available for most water heater replacements, and we’re reachable 24/7 for emergencies.

Get a Free Estimate on Water Heater Replacement in St. Louis

Whether your unit has stopped working, is showing early warning signs, or you’ve received a replacement recommendation you want a second opinion on, Dunn Plumbing, Heating & Air Conditioning, LLC is ready to help. Free estimates on all new installations, free second opinions on condemned equipment, and a written money-back guarantee mean there’s no risk in calling us first.

Contact Dunn Plumbing, Heating & Air Conditioning, LLC at (314) 476-9606 to schedule your free estimate or get a second opinion on your water heater. We’re available 24/7 for emergencies.