When Arlington Heights homeowners and businesses need professional tankless water heater installation services, they turn to Plumbers 911 Chicago. We've been serving the Arlington Heights community and surrounding Cook County neighborhoods with expert plumbing solutions backed by licensed, bonded, and insured technicians.
Tankless water heaters deliver unlimited hot water on demand, take up a fraction of the space of a traditional tank, and last nearly twice as long. For Arlington Heights homeowners looking to upgrade from a bulky, inefficient tank water heater, a tankless system offers real advantages — but only when it's properly sized and professionally installed. Plumbers 911 installs all major tankless brands and handles the gas line, venting, and plumbing modifications required for a successful conversion.
Tankless Water Heater Benefits
Unlimited Hot Water — No tank to empty. Hot water is produced on demand for as long as you need it, making tankless ideal for larger Arlington Heights families or homes with multiple bathrooms.
Space Savings — Wall-mounted units free up the floor space occupied by a 40–75 gallon tank. Ideal for small mechanical rooms, closets, or even exterior wall mounting.
Longer Lifespan — 15–20 years vs. 8–12 for tank water heaters. Replaceable components (heat exchanger, burner) can extend life even further.
Energy Savings — No standby heat loss (the energy wasted keeping 40–75 gallons of water hot 24/7). Tankless units are 20–35% more efficient than conventional gas tanks. Annual savings of $100–$200+ on gas bills.
Reduced Flood Risk — No 40–75 gallon tank that can catastrophically fail and flood your basement.
Tankless Installation Requirements
Converting from a tank to tankless water heater involves more than just a swap. Here's what's typically required:
Gas Line Upgrade — Tankless units have higher BTU ratings than tank water heaters and often require a larger gas supply line (typically ¾" or 1" vs. the ½" that feeds most tank units). We assess your existing gas line capacity and upgrade as needed.
Venting Changes — Tank water heaters use a natural draft metal vent into the chimney. Tankless units require either direct vent (concentric pipe through the wall) or power vent (PVC/stainless through the wall or roof). The old chimney vent cannot be reused.
Electrical Connection — Tankless units require a 120V electrical outlet for the electronic controls and ignition. Most tank water heater locations don't have a nearby outlet.
Condensate Drain — High-efficiency condensing tankless units produce acidic condensate that must be drained to a floor drain or neutralizer.
Water Line Connections — Supply and return connections, plus isolation valves and service ports for annual descaling maintenance.
We handle all of these modifications as part of our turnkey installation.
Tankless Water Heater Sizing for Arlington Heights
Proper sizing is critical — an undersized tankless unit delivers lukewarm water in winter:
Temperature Rise — Arlington Heights incoming water temperature drops to approximately 37°F in winter. To deliver 120°F hot water, the unit needs an 83°F temperature rise. Many tankless units that claim 8+ GPM achieve that flow only at a 35°F rise — meaning they deliver far less in winter.
Sizing Guidelines:
- 1 bathroom home: 6–7 GPM (140,000–160,000 BTU)
- 2 bathroom home: 8–9 GPM (160,000–180,000 BTU)
- 3+ bathroom home: 10–11 GPM (180,000–199,000 BTU) or dual units
We size every installation based on winter conditions, not the optimistic summer ratings printed on the box.
Tankless Water Heater Installation Costs
Tankless Unit (equipment): $1,500–$3,000 depending on brand, capacity, and features
Installation Labor & Materials:
- Standard installation (existing gas, simple venting): $1,000–$1,500
- Full conversion from tank (gas line upgrade, new venting, electrical, condensate): $1,500–$2,500
Total Installed Cost: $2,500–$5,500
Ongoing Savings:
- Annual gas savings: $100–$200+
- Extended lifespan: 15–20 years vs. 8–12 (avoiding one full tank replacement over the tankless unit's life)
We provide detailed estimates with all modification costs broken out before work begins.
Why Arlington Heights Chooses Plumbers 911 Chicago
Local Arlington Heights Experts
We understand Arlington Heights' residential plumbing infrastructure, from older homes near downtown to newer developments. Our plumbers know Cook County codes inside and out.
24/7 Emergency Response
Plumbing emergencies don't wait for business hours. Our Arlington Heights plumbers are available around the clock with fast response times throughout the 60004, 60005, and 60006 zip codes.
Upfront, Honest Pricing
We provide detailed written estimates before starting any work. No surprise charges, no hidden fees — just transparent, fair pricing on every job.
Licensed, Bonded & Insured
Every technician is State of Illinois licensed, bonded, and fully insured. We pull all required permits and ensure 100% code compliance.