Installation Guide
Gas Tankless Installation Cost: Complete Breakdown
The honest answer: $2,500-$6,000 total installed cost in Nashville. Here's exactly what you're paying for:
Navien NPE-2 series condensing tankless based on size needed
- 6-7 GPM models (1-2 bathrooms): $1,400-$1,700
- 8-9 GPM models (2-3 bathrooms): $1,800-$2,300
- 10-11 GPM models (3-4 bathrooms): $2,200-$2,600
Professional installation by licensed plumber
- Straightforward swap: $800-$1,200
- Complex installation: $1,200-$1,500
- Includes mounting, connections, testing
Upsize from 1/2" to 3/4" if needed
- Short run (under 30 feet): $350-$500
- Longer run (30-60 feet): $500-$750
- Not always required—we evaluate
PVC intake and exhaust vent pipes
- Short run (under 20 feet): $100-$250
- Moderate run (20-50 feet): $250-$400
- Long run (50-75 feet): $400-$600
120V outlet for tankless controls
- Outlet nearby: $100-$150
- New circuit run: $150-$250
- Only 2-4 amps required
Required for code compliance
- Nashville Metro: $50-$100
- Franklin/Brentwood: $75-$150
- We handle everything
Real-World Nashville Installation Examples
Tankless in same garage location, 3/4" gas line adequate, short vent run
Relocated to attic, gas line upsized 1/2" to 3/4" (30 ft), new PVC venting through roof, new outlet
Exterior wall install, 50-foot gas line run, gas meter upgraded, outdoor vent kit
What's Included in Will's Friends Installation
When you choose Will's Friends, here's exactly what we do—no shortcuts, no surprises.
We evaluate your fixtures, calculate peak demand, inspect infrastructure, and provide a detailed quote with everything included.
We pull permits, pay fees, and ensure code-compliant installation. You don't lift a finger.
We drain, disconnect, and haul away your old tank water heater. No mess left behind.
Gas line upsizing, electrical outlet installation, venting prep—all done to code.
Wall mounting, water connections, gas connections, venting, electrical—professional installation.
Testing, temperature setting, leak checks, performance verification, and owner training.
Installation Day: Step-by-Step Process
MorningPreparation & Removal
- • Arrive on time (30-minute text heads-up)
- • Lay drop cloths and floor protection
- • Shut off water, gas, and power
- • Drain and disconnect old tank
- • Remove old tank and venting (haul-away included)
Mid-DayInfrastructure Upgrades
- • Gas line upsizing if needed (pressure-tested)
- • Electrical outlet installation if needed
- • PVC venting installation with proper slope
- • All work done to code specifications
AfternoonTankless Installation
- • Mount tankless unit on wall studs
- • Connect water inlet/outlet with shutoff valves
- • Connect gas line with shutoff and sediment trap
- • Connect vent pipes with proper seals
- • Connect electrical power
- • Install recirculation if equipped
Late AfternoonCommissioning & Training
- • Fill system and purge air
- • Power on and set temperature
- • Test multiple fixtures simultaneously
- • Check for leaks (water and gas)
- • Verify venting draft and condensate drainage
- • Train you on operation and maintenance
- • Clean work area completely
Nashville-Area Installation Considerations
Pre-1980:
Likely 1/2\" gas lines need upsizing
1980-2010:
Often tankless-ready with minor upgrades
Post-2010:
Usually tankless-ready infrastructure
Nashville: ~100.5 mg/L hardness
- • Annual descaling required
- • Sediment filter recommended
- • Water softener optional but beneficial
55-60°F year-round average
- • 62-65°F temperature rise needed
- • Better than northern states
- • Smaller units work efficiently
Gas Tankless
Tank Heater
Electric Tankless
Installation Cost: Your Questions Answered
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