Tankless Water Heater Installation in St. Louis
DeClue Plumbing gives St. Louis homeowners instant, endless hot water and the energy savings to prove it.
Tyler is phenomenal and all on his team take pride in their work. Inspections pass as code knowledge is superb and all of the work is excellent! We would recommend Declue Plumbing to every investor and homeowner in the St Louis metro. Trustworthy and an outstanding outfit. Declue Plumbing has worked with Apex Remodeling on many projects over the years and we appreciate their service!
KJ – Kyra Jyring
Apex Remodeling LLC
DeClue Moves You to On-Demand Hot Water
Tankless water heater installation means your water heats the moment you need it and stops the second you don’t. No standby energy waste, no running out mid-shower, and no unit limping along on borrowed time. We walk you through every option, give you a straight estimate, and get the work done right so you’re not back to square one in five years. One of our South St. Louis customers made the switch for a single bathroom and noticed the difference on their very next gas bill.
When It's Installed Right, It'll Still Be Running Strong 20 Years From Now
A tankless unit that’s properly sized and correctly installed can outlast two or three traditional tanks. DeClue Plumbing makes sure the job is done to code, the unit is matched to your home’s actual demand, and nothing is left to chance. You’re not just buying hot water today. You’re buying a system that won’t let you down a decade from now.
Your Gas Bill Will Notice the Difference Too
Tank heaters burn energy around the clock just to keep water warm and waiting. With a properly installed tankless system, you’re only using energy when you actually need hot water. That shift adds up fast, and most homeowners feel it on their first bill after we complete the installation.
Discover What Instant Hot Water Can Do for Your Home
Stop planning your morning around who gets the hot water first and let DeClue fix it for good. Contact us today and get a professional estimate.
What Makes DeClue Plumbing Different
Not every tankless water heater contractor in St. Louis shows up on time, does the job right, and stands behind their work. DeClue does all three, and then some:
- Licensed, bonded, and insured
- We use brands we have in our own homes
- STL born and bred since 2009
- We handle manufacturer claims directly
- Emergency service, any season
- 1-year labor warranty included
Case Study
Instant Hot Water for a St. Louis Homeowner
See what happens when St. Louis homeowners stop guessing and let us handle their tankless water heater installations from start to finish.
A homeowner came to DeClue Plumbing with a bathroom that was last in line for hot water, lukewarm at best, with a gas bill that kept climbing and an aging tank ready to give out. They didn’t just want a replacement. They wanted a real solution that was actually going to last.
Our team assessed the home, sized the right unit, and completed a professional tankless water heater installation in a single visit. As experienced tankless heater installers, we handled everything from the typed estimate to code-compliant execution. No surprises, no callbacks, no mess left behind.
Instant hot water from day one. A real, measurable drop in monthly gas costs. And when the time came to navigate the manufacturer’s warranty, DeClue made every call on the homeowner’s behalf. No runaround. No hold music. Just results that speak for themselves.
Frequently Asked Questions About Our Tankless Water Heater Installation Services
Does DeClue Plumbing serve my area of St. Louis?
We work throughout the St. Louis metro, including Florissant, Webster Groves, South City, the North County, and everywhere in between. If you’re in the STL area and your water heater needs to go, chances are we’re already working in your neighborhood. Give us a call, and we’ll confirm we can get to you.
How long does a tankless water heater installation actually take?
Most residential tankless water heater installations are completed in a single visit. We show up, confirm the scope matches the estimate, pull the materials, and get to work. For straightforward swaps, you can expect the same day. More complex installs that require gas line adjustments or additional code compliance work may take a little longer, and we’ll always tell you that upfront before we start.
Will my home's existing gas line or electrical setup cause any problems?
It depends on what you have and what you’re switching to. Some homes need a gas line upgrade to support a tankless unit’s higher BTU demand, and others are ready to go as-is. That’s exactly why DeClue Plumbing does a full assessment before we ever quote you a number. We look at your existing setup, identify anything that needs to be addressed, and build it into the estimate so nothing surprises you on installation day.