Quick Answer
The tone of the direct answer is a bit alarmist and overly aggressive with the 'No. Just no.' delivery. While the underlying message about professional installation is correct and crucial, the delivery could be more balanced and professional. It also oversimplifies the DIY cost for conversion, which should really be excluded or clearly marked as extremely dangerous/not recommended.
Common Symptoms
Possible Causes
Step-by-Step Diagnosis
Step 1
Get down to your mechanical room and assess the existing utilities. Measure the diameter of your gas line from the meter to the heater and check the amp rating on your main electrical panel.
Step 2
Figure out a realistic location and venting path. You'll need an exterior wall with clear space to drill two or three holes for the intake and exhaust pipes, away from windows and other openings per code.
Step 3
Evaluate your plumbing. See what kind of pipes you have (copper, PEX) and determine if major re-routing is needed to connect to the new unit's location.
Step 4
Call your local building department. Don't guess. Ask them what the permit requirements and inspection process are for a tankless water heater installation.
Step 5
Be honest about your hot water usage. Count your showers and faucets, and figure out the max GPM you'd ever need at one time to size the unit correctly for your climate.
DIY vs Professional Costs
| Repair Type | DIY Cost | Professional Cost | Time Required |
|---|---|---|---|
Full Gas-to-Gas Tankless Conversion | $1,500 - $3,000+ | $3,500 - $8,000 | 1-2 days |
Gas Line Upgrade Only | $100 - $400 | $500 - $2,500 | 4-8 hours |
Electrical Upgrade for Electric Unit | $150 - $400 | $800 - $4,000+ | 1-2 days |
New Venting Installation | $100 - $300 | $400 - $1,800 | 3-6 hours |
When to Call a Professional Water Heater
- The moment you decide you want a tankless water heater. Call for quotes before you buy anything.
- Anytime a gas line needs to be run, modified, or connected.
- When a new high-amperage electrical circuit needs to be installed or your electrical panel needs to be upgraded.
- If you don't know the local building codes for venting and gas installation off the top of your head.
- When you lack professional-grade tools like a combustion analyzer, a gas leak detector, or pipe threading/pressing tools.
Prevention Tips
- Annually descale your tankless water heater using a pump and vinegar solution to remove mineral buildup from the heat exchanger.
- If you live in an area with hard water, install a whole-house water softener to protect your tankless unit and all other water-using appliances.
- Choose a reputable brand known for reliability and parts availability, like Rinnai, Navien, or Noritz, instead of a no-name online deal.
- Periodically clean the cold water inlet screen filter to prevent sediment from clogging the unit.
Frequently Asked Questions
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