Ready to Switch to Tankless? We Install It Right.
Tankless water heater installation, repair, and maintenance for homes and businesses across Metro East Illinois, currently offering $250 off a tankless upgrade.
- Repair-first approach, we fix it when we can
- Licensed, Bonded & Insured
- 100% satisfaction guarantee
- Repair-first approach, we fix it when we can
- Licensed, Bonded & Insured
- 100% satisfaction guarantee
- Repair-first approach, we fix it when we can
- Licensed, Bonded & Insured
- 100% satisfaction guarantee
- Repair-first approach, we fix it when we can
- Licensed, Bonded & Insured
- 100% satisfaction guarantee
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From Emergency Repairs to Full Installations
Whether it’s a leaking pipe, a failing water heater, or plumbing for a brand-new build, our licensed team handles projects of every size across the metro east region.
Emergency Plumbing
Burst pipes, sewer backups, no hot water, when it can’t wait, we answer. Day or night, Priority Plumbing shows up fast and fixes it right the first time.
Drains &
Sewer
Slow drains, clogs, and sewer line problems don’t fix themselves. From drain cleaning to full sewer replacement, we diagnose the root cause and get it flowing again.
Commercial Plumbing
Businesses can’t afford plumbing downtime. We handle everything from backflow testing and maintenance contracts to restaurant drain service and new construction rough-ins.
Water
Quality
If your water smells, tastes off, or leaves buildup on everything — there’s a fix. We install whole-home filtration, water softeners, HALO systems, and treat well water at the source.
Water
Heaters
No hot water is never convenient. We repair, replace, and install both tank and tankless water heaters — usually same day, and always with upfront pricing.
Pumps
Sump pumps, well pumps, ejector pumps — we install, repair, and replace all of them. Don’t wait for a pump failure to become a flooded basement or a dry tap.
Emergency Plumbing
Burst pipes, sewer backups, no hot water, when it can’t wait, we answer. Day or night, Priority Plumbing shows up fast and fixes it right the first time.
Drains &
Sewer
Slow drains, clogs, and sewer line problems don’t fix themselves. From drain cleaning to full sewer replacement, we diagnose the root cause and get it flowing again.
Commercial Plumbing
Businesses can’t afford plumbing downtime. We handle everything from backflow testing and maintenance contracts to restaurant drain service and new construction rough-ins.
Water
Quality
If your water smells, tastes off, or leaves buildup on everything — there’s a fix. We install whole-home filtration, water softeners, HALO systems, and treat well water at the source.
Water
Heaters
No hot water is never convenient. We repair, replace, and install both tank and tankless water heaters — usually same day, and always with upfront pricing.
Pumps
Sump pumps, well pumps, ejector pumps — we install, repair, and replace all of them. Don’t wait for a pump failure to become a flooded basement or a dry tap.
On-Demand Hot Water Without the Tank
A traditional tank water heater keeps 40 to 50 gallons of water hot around the clock, whether you’re using it or not. Standby heat loss is the cost of that convenience. A tankless water heater heats water only when you call for it, flowing cold water triggers the burner or heating element, and hot water arrives at the fixture without a storage tank in between.
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The result is hot water that doesn’t run out, energy used only when water is actually being heated, and a unit that takes up a fraction of the space a tank requires. Tankless units are also significantly longer-lived, a properly maintained tankless water heater typically lasts 20 years or more versus 10 to 15 years for a traditional tank. We install and service both gas and electric tankless units for residential and commercial customers throughout Metro East Illinois.
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Priority Plumbing Services is licensed, bonded, and insured in Illinois (License No. 055-045366). We’re currently offering $250 off a tankless water heater upgrade, ask about it when you call. Every tankless installation is backed by our 1-year warranty and 100% satisfaction guarantee.
Signs Your Tankless Water Heater Needs Service
- Tankless Unit Displaying an Error Code
Tankless water heaters communicate problems through error codes on the display panel, codes that indicate ignition failure, overheating, flow sensor issues, venting problems, or scale buildup restricting the heat exchanger. An error code that won’t clear after a reset is the unit telling you it needs a licensed technician. We diagnose error codes on all major tankless brands and repair the underlying cause, not just reset the display.Â
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Urgency: Call soon — an unresolved error code means the unit is not operating as designed and may not be producing reliable hot water.
- Inconsistent Hot Water or Temperature Fluctuations
A tankless unit that delivers hot water inconsistently, temperature surging or dropping mid-shower, hot water cutting in and out, is often experiencing a flow sensor issue, a failing gas valve, or a heat exchanger restricted by scale buildup. Scale accumulation from hard water is the most common cause of declining performance in tankless units throughout Metro East Illinois.Â
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Urgency: Schedule soon — inconsistent temperature usually points to a developing issue that worsens over time.
- Cold Water Sandwich Effect
The cold water sandwich, a brief burst of cold water in the middle of an otherwise hot shower, is a normal characteristic of tankless operation in some configurations, not a malfunction. It happens when the unit fires for a small hot water demand, shuts off, and then fires again, the cold water sitting in the line between uses arrives before the new heating cycle reaches the fixture. If it’s getting worse or more frequent, a technician can assess whether a system modification addresses it.Â
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Urgency: Not urgent — but worth a call if it’s become disruptive to daily use.
- Unit Hasn't Been Descaled in Over a Year
Hard water scale accumulates on the heat exchanger coils of a tankless unit over time, the same mineral buildup that affects tank water heaters, but in a more sensitive component. Annual descaling flushes a vinegar or citric acid solution through the heat exchanger to dissolve scale and restore heat transfer efficiency. A unit that hasn’t been descaled in over a year in a hard water area like Metro East Illinois is overdue. We’re currently offering $199 for a tankless water heater flush.Â
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Urgency: Schedule soon — scale accumulation reduces efficiency and can cause the unit to error out or overheat if left too long.
- Your Traditional Tank Is Near End of Life and You're Considering a Switch
If your traditional tank water heater is 10 years or older and you’re facing a repair or replacement decision, a tankless upgrade is worth evaluating alongside a straight tank replacement. The energy savings, longer lifespan, and unlimited hot water of a tankless unit make it a compelling long-term choice, and with $250 off the upgrade, the cost difference between tank replacement and tankless installation narrows considerably.Â
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Urgency: No emergency — but if you’re already facing a water heater decision, evaluate tankless before defaulting to another tank.Â
Types of Tankless Water Heater Service We Handle
- Tankless Water Heater Installation, New or Upgrade
New tankless installation for new construction, and upgrade installation replacing an existing tank water heater with a tankless unit. We assess your household’s hot water demand, gas supply capacity or electrical service for electric units, and venting requirements before selecting and sizing the right unit. Correct sizing is critical for tankless, an undersized unit can’t keep up with simultaneous demand, and we size it right the first time.Â
- Tankless Water Heater Repair
Error code diagnosis and repair, ignition system service, gas valve repair, flow sensor replacement, venting correction, and heat exchanger service for all major tankless brands. Our repair-first approach applies here, if the unit can be repaired at a cost that makes sense relative to its age and condition, we repair it. We give you the honest repair vs replace comparison before recommending either.
- Tankless Water Heater Flush & Descaling
Annual descaling service, flushing a descaling solution through the heat exchanger to dissolve mineral scale buildup and restore heat transfer efficiency. Recommended annually for all tankless units in hard water areas, which includes most of Metro East Illinois. Currently offered at $199. Includes a system check and filter cleaning during the same visit.
- Commercial Tankless Water Heater Service
Tankless water heater installation, repair, and maintenance for restaurants, commercial kitchens, multi-unit residential buildings, and commercial facilities with high hot water demand. Commercial tankless applications require higher-capacity units and often multiple units in a manifold configuration, we size and install correctly for commercial demand.
Benefits of Tankless Water Heaters
- Hot Water That Doesn't Run Out
A tank water heater has a finite supply, once the tank empties, you wait for recovery. A properly sized tankless unit heats water on demand at the rate you need it, so the fourth person in the house to shower gets the same hot water as the first. For households with high simultaneous demand or a pattern of running out of hot water, this is the most immediately noticeable benefit of going tankless.
- Meaningful Energy Savings
Tankless water heaters can be 24–34% more energy efficient than conventional tank water heaters for homes using 41 gallons or less of hot water daily, because they don’t maintain standby heat in a stored tank. For higher-demand homes using 86 gallons or more per day, efficiency gains of 8–14% are more typical. Either way, you’re not heating water you’re not using, and that shows up on your energy bill.
- Longer Service Life Than a Tank Unit
Traditional tank water heaters typically last 10–15 years. A properly maintained tankless unit lasts 20 years or more, and most components can be replaced individually rather than replacing the whole unit when something fails. Over a 20-year period, a tankless unit that’s serviced annually is often the more cost-effective choice when total cost of ownership is calculated, not just the upfront installation price.
- Space Savings and Installation Flexibility
A tankless unit mounts on the wall, typically the size of a small suitcase, versus a 50-gallon tank that occupies significant floor space in a utility room, basement, or closet. Freed floor space and the option to install closer to the point of use, reducing the distance hot water travels, are practical advantages beyond the energy performance.
- Annual Maintenance Protects the Investment
A tankless unit that’s descaled annually in a hard water area like Metro East Illinois performs better, runs more efficiently, and lasts longer than one that’s ignored until it errors out. Annual maintenance at $199 per year is a straightforward investment in the unit’s performance and longevity. We track service intervals for customers who want a reminder when it’s time.
Your Problem, Solved in 4 Simple Steps
We make the process simple so you can get back to what matters.
Call, Text, or
Book Online
Reach out however works best for you. Prefer not to talk on the phone? Book through our online scheduler anytime.
Get a Quote or Get Scheduled
Need a price first? We'll give you one. Ready to go? We'll get you on the schedule — same day when possible. You'll get a text or email confirmation.
We Show Up and Do the Work
Our licensed team arrives on time, explains what we're doing, and treats your home like our own. No surprises.
Transparent Billing, Warranty in HandÂ
You get a clear invoice and a 1-year warranty on our work. If anything isn't right, we come back and fix it.
WE'LL BE IN TOUCH
Hear It From Your Neighbors
The five star standard we hold ourselves to
- Susan Donaldson
- Tim Darling
- Connor Stich
- Lena Faitz
- Jennifer Diesen
- r williams
Proudly Serving Five Counties Across Southern Illinois
From our home base in Pocahontas, we serve homes and businesses across Madison, Bond, Clinton, Montgomery, and Macoupin Counties. One local team that shows up fast and gets it done right. If you’re in the Metro East or surrounding areas, we’ve got you covered!
Tankless Water Heater Questions
Is a tankless water heater worth it?
For most households, especially those replacing an aging tank or experiencing hot water shortages, yes. The upfront cost is higher than a straight tank replacement, but tankless units last longer, cost less to operate, and eliminate the problem of running out of hot water. With $250 off the upgrade, the cost gap narrows. We give you both costs, tankless installation vs tank replacement, with honest numbers so you can make the call that makes sense for your situation.
How much does tankless water heater installation cost?
Installation cost depends on the unit selected, whether a gas line upgrade is needed, and the venting configuration required. We provide a written estimate covering all components before work begins, with the $250 off upgrade discount applied. Financing is available through Wisetack for the balance if needed.Â
Can my existing gas line handle a tankless water heater?
Not always. Tankless units fire at a significantly higher BTU rating than tank water heaters, often 150,000–200,000 BTU versus 30,000–40,000 BTU for a standard tank. That higher demand may require upgrading the gas line supplying the unit. We assess your existing gas supply capacity before installation and include any required gas line upgrade in the written estimate so there are no surprises.Â
How often does a tankless water heater need to be flushed?
Annually, especially in Metro East Illinois where water hardness is moderate to high in most areas. Hard water scale accumulates on the heat exchanger coils over time, reducing efficiency and eventually causing the unit to error out or overheat. Annual descaling with a citric acid or white vinegar flush removes the scale and keeps the unit performing as designed. We’re currently offering the tankless flush service at $199, ask when you call.
What brands of tankless water heaters do you install and service?
We install and service all major tankless water heater brands found in Metro East Illinois homes and businesses. When recommending a unit for installation, we match the brand and model to your fuel type, demand, and budget, and explain our reasoning. We’re not locked to a single brand, we recommend what fits your situation.
Do you install tankless units for commercial applications?
Yes. Commercial tankless installation for restaurants, multi-unit buildings, and facilities with high hot water demand throughout Metro East Illinois. Commercial applications often require high-capacity units or multiple units in a manifolded arrangement, we size and configure correctly for commercial demand. Call (618) 207-1647 to discuss your facility.