Quick Answer
The direct answer is accurate and effectively highlights the common pitfalls and cost implications, which is excellent for setting realistic expectations. The cost range provided ($2,500 - $6,000+) is also realistic.
Common Symptoms
Possible Causes
Step-by-Step Diagnosis
Step 1
Check the power source. For gas, verify the gas valve is open. For electric, check the breakers in the main panel; they are often massive 40-60A double-pole breakers.
Step 2
Verify the infrastructure. Trace the gas line back to the meter to confirm it's 3/4" or larger. For electric, check the wire gauge going to the unit; it should be very thick (e.g., #6 or #8 AWG).
Step 3
Calculate the required temperature rise. Find your area's coldest groundwater temperature and subtract it from 120°F. Compare this to the unit's GPM capacity at that rise, listed in the manual.
Step 4
Inspect all plumbing connections for drips or signs of leaks. Confirm an isolation valve kit with a pressure relief valve was installed.
Step 5
Inspect the venting system from the unit to the exterior termination. Ensure the material is correct (PVC for condensing, stainless steel for non-condensing) and that it's sloped correctly (typically 1/4" per foot).
DIY vs Professional Costs
| Repair Type | DIY Cost | Professional Cost | Time Required |
|---|---|---|---|
Gas Line Upgrade (to 3/4" or 1") | $200-500 | $500 - $2,000+ | 4-8 hours |
Electrical Upgrade (New Breakers/Wiring) | $150-400 | $600 - $2,500+ | 4-10 hours |
New Venting System (PVC or Stainless) | $100-300 | $400 - $1,500 | 3-6 hours |
Full Electrical Panel Upgrade | DO NOT DIY | $1,500 - $4,000+ | 1-2 days |
When to Call a Professional Water Heater
- The moment you decide to switch from a tank to a tankless heater, you should call for a consultation BEFORE buying anything.
- Anytime work is needed on a gas line. Do not touch it yourself.
- When new electrical circuits, a subpanel, or a main panel upgrade are required for an electric unit.
- If you smell gas, see persistent leaks, or have breakers tripping after an installation attempt.
- If you are unsure about local building codes, permits, and venting requirements.
Prevention Tips
- Get a professional consultation BEFORE you buy a unit to have it properly sized for your home's unique needs.
- Ensure your contractor is pulling all necessary permits for gas and electrical work. No permit is a major red flag.
- Insist on the installation of a full isolation valve kit to make future maintenance (like descaling) much easier.
- Budget for infrastructure upgrades. Assume you will need a new gas line or significant electrical work as part of the total cost.
Frequently Asked Questions
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