Water heater installation goes wrong more often than most Franklin, TN homeowners expect, and the bill shows up later. The wrong size, a skipped code check, or bad venting turns a routine job into a safety problem. Parthenon has installed and serviced water heaters across Middle Tennessee since 2008, backed by more than 150 years of combined team experience.
The seven mistakes below cause most of the failures we get called out to fix. Every one of them is avoidable before the tank is set.
Key Points
- Size the tank to your household’s peak demand, not the cheapest option
- Franklin building codes exist for safety and affect resale
- Bad venting risks carbon monoxide buildup, not just efficiency
- Energy Factor rating decides your operating cost for a decade
- Skipping maintenance undoes a good installation within a few years
Mistake 1: Picking the Wrong Size Tank
One of the most common mistakes is choosing the wrong size water heater. Pick one that is too small and you run out of hot water mid-shower or while washing dishes.
Go too large and you pay higher energy bills and waste space. Assess your household’s hot water needs based on occupants and daily usage instead.
Think about peak demand, like when everyone showers in the morning. Calculate the right capacity in gallons for your situation. The Energy.gov sizing guide walks through how first-hour rating maps to household demand.
A professional determines the right size so you get both efficiency and comfort. Weigh energy efficiency ratings too, since they drive long-term savings. Investing time here saves headaches later and keeps your home running smoothly.
Mistake 2: Skipping Franklin’s Building Codes
Overlooking local building codes and regulations creates significant problems down the line.
Codes exist to protect safety and efficiency, and ignoring them can mean fines or costly rework. Skipping them looks like a time or money saver, but it sets up real hazards.
Improper installation leads to leaks, gas leaks, or fire risk.
Non-compliance also complicates the sale process if you ever decide to sell your home.
Familiarize yourself with the specific building codes for Franklin, TN, or consult a professional. Regular water heater repair service keeps the unit operating efficiently and in line with local requirements.
Mistake 3: Getting the Venting Wrong
Proper ventilation is not optional. Inadequate airflow creates dangerous conditions, including carbon monoxide buildup. Here are the venting errors we see most and what they do to your safety and efficiency.
Why Venting Protects Your Family
Neglecting ventilation during water heater installation creates serious safety hazards and inefficiency.
Adequate ventilation expels harmful gases, carbon monoxide included, out of your living space. A poorly vented water heater degrades your air quality and your health along with it.
Improper ventilation also forces the water heater to work harder than necessary, which raises energy bills and shortens the unit’s life.
Prioritizing ventilation improves safety and performance at the same time.
The Venting Errors We See Most
The most common venting error is failing to follow local building codes and manufacturer guidelines.
Homeowners overlook how much ventilation a water heater actually needs, and carbon monoxide buildup follows. Existing ventilation is not automatically sufficient. Assess it against the new water heater’s requirements.
Insufficient airflow also cuts efficiency and raises energy bills. Consult a professional so your installation meets every safety standard.
Ignoring ventilation compromises your water heater’s performance and your home’s safety. Do not take shortcuts here.
Mistake 4: Handling Water Heater Installation Yourself
DIY looks like the cost-effective choice, and it creates significant problems down the line.
Tackling this yourself risks improper installation, which means leaks, inefficient heating, or safety hazards. Without a licensed technician, you may miss local codes or manufacturer guidelines, which brings fines or voided warranties.
Hiring professionals gets your water heater installed correctly and safely. Our experienced team knows the differences between systems and tailors the installation to your needs. With guaranteed satisfaction and no hidden fees, your home is in good hands.
Our professional water heater installation is handled start to finish by a licensed Franklin, TN plumber.
Do not cut corners. Invest in professional installation for lasting efficiency and safety.
Mistake 5: Ignoring the Energy Factor Rating
Many homeowners overlook energy efficiency ratings when choosing a water heater, which drives up utility bills and environmental impact.
The cheapest option is tempting, and it costs more in the long run. Energy-efficient models save money and reduce your carbon footprint.
Look for the Energy Factor rating to gauge efficiency. The higher the EF, the better the performance.
Tankless water heater installation often delivers higher efficiency ratings than traditional tank models.
A good efficiency rating means lower monthly costs and a more sustainable home. It is not only about the purchase price. Consider what you save over time.
Mistake 6: Forgetting Maintenance After the Install
Once a water heater is in, the maintenance that keeps it running is easy to overlook.
Regular inspections and tank flushing prevent bigger issues and extend the unit’s life.
Do not wait for problems to arise. Proactive care is what keeps hot water reliable.
What a Yearly Inspection Catches
Regular water heater inspections matter, because neglected maintenance leads to costly repairs and lost efficiency.
Staying proactive saves money and keeps the system running smoothly. Three reasons to prioritize inspections:
- Identify issues early: catching minor problems before they escalate saves you from expensive repairs later.
- Maximize efficiency: regular check-ups maintain peak performance, reduce energy costs, and extend the unit’s lifespan.
- Protect safety: inspections identify hazards like leaks or corrosion that put your home and family at risk.
Schedule your water heater inspection before something forces the issue.
Why Flushing the Tank Matters
Skipping the flush creates a run of problems that hit performance and longevity.
Sediment builds up in the tank over time, cutting efficiency and causing rust or corrosion. That buildup also causes overheating, which raises the risk of leaks or outright tank failure.
Flushing regularly maintains a consistent hot water supply and extends the tank’s life. It improves efficiency too, which shows up on your utility bills.
A well-maintained water heater also runs quieter. Do not overlook this step. It is a simple way to protect the investment.
Mistake 7: Skipping the Safety Hardware
Cutting corners on safety features during water heater installation creates serious hazards.
Three safety measures protect your home and family:
- Pressure relief valve: this component prevents excess pressure buildup, which can cause catastrophic failures.
- Proper ventilation: make sure your water heater is adequately ventilated to avoid dangerous gas buildup, especially if it is gas-powered.
- Seismic straps: for the extra-cautious, seismic straps keep your water heater from tipping over during earthquakes. Earthquakes in Middle Tennessee are rare, though there was one reported by TEMA in Park City, TN, only 1.5 hours south of Nashville, in June 2025.
Get Your Franklin Water Heater Installation Right
Avoiding these mistakes saves you time, money, and headaches. Paying attention to size, local codes, venting, and safety features gets you a smooth water heater installation that keeps your home comfortable and efficient.
Take the time to get it right the first time. Request a free estimate and we will size the system to your home before anything gets ordered.
