What’s the Process of a Water Heater installation?

how to install water heater
June 16, 2025

Installing a new water heater is a big project. At Paradise Plumbing, we want homeowners in Southampton, Shirley, Quogue, and Easthampton to feel assured of the process.

Process of a Water Heater installation

Here is a step-by-step explanation of what we do, and what you can look forward to when installing your water heater.

Step 1: Planning, Selection & Permits

Assess Your Needs

    • Traditional tank heaters hold between 40–80 gallons, good for families with typical usage.
    • Tankless models provide hot water on demand, consistent pressure, and save space, great for modern homes.

Choose Energy Type

    • Most Long Island homes use gas, but electric models are also popular.
    • Tankless units can be gas or electric; installation requires evaluating your home’s gas line capacity and electric panel.

Obtain Permits

    • Suffolk County, like many regions, requires permits for water heater installations.
    • We handle all permit applications to ensure code compliance and pass inspections.

Step 2: Preparation & Safety Precautions

Turn Off Utilities

    • Shut off the water supply at the main valve.
    • For electric heaters, turn off the breaker; for gas units, close the gas valve.

Ventilation & Space Check

    • Gas units need proper flue clearance.
    • Electric units require a safe working area around the tank.

Tools & Materials

    • We bring everything—including pipe wrenches, connectors, Teflon tape, pressure relief valves, drip pans, and flexible hoses—so you don’t have to worry about missing gear.

Step 3: Remove the Old Heater

Drain the Tank

    • Connect the hose to drain valve and empty contents into a floor drain or bucket.

Disconnect Utilities

    • For electric: disconnect wiring after verifying breaker is off.
    • For gas: detach the gas line and inspect for damage.
    • Disconnect hot and cold-water lines.
    • Remove the expansion tank or sediment trap if installed.

Safely Remove the Unit

    • Carefully roll out the old heater, using a dolly if needed.

Step 4: Positioning the New Heater

Proper Placement

    • Ensure proper clearances, especially around vents for gas models.
    • Add a drip pan under the new tank to protect flooring.

Install Expansion Tank (if required)

    • Suffolk homes with backflow preventers or water softeners require expansion tanks to manage pressure changes.

Step 5: Reconnect Plumbing & Utilities

Water Lines

    • Connect cold and hot water supply lines using Teflon tape for leak-free joints.

Pressure Relief Valve

    • Install the T&P valve and a discharge pipe that leads to a safe location.

Gas or Electric Connections

    • Gas units: connect gas line with flexible connector, then test with a soapy solution for leaks and do tightening if needed.
    • Electric units: run a 240‑volt line, install a 30‑amp breaker, and connect using waterproof connectors.

Step 6: Fill & Test the New Unit

Fill the Tank

    • Open cold-water input valve: let a hot faucet run until air is purged.
    • Inspect all fittings and valves for leaks.

Start the Unit

    • Gas: open gas valve, light pilot per manufacturer instructions, and observe flame.
    • Electric: restore power via breaker, then set thermostat (typically 120°F for safety) and let water heat.

Final Check

    • Monitor for leaks, verify pressure relief valve functions, and ensure thermostat is set correctly.

Professional Inspection

    • Our final step is a thorough inspection: gas leak test, venting check, piping integrity, and continuity of electrical bond.

Step 7: Clean-Up & Customer Handoff

  • Remove old water heater, recycle or responsibly dispose of it.
  • Show you how to operate and adjust your new heater safely.
  • Provide maintenance tips: annual drains to remove sediment, regular inspections, and expansion tank checks.

Full Video Guide

 

Why Choose Paradise Plumbing?

  • Local Permitting: We handle all permitting and scheduling of inspections.
  • Safety First: Full compliance with Suffolk County codes.
  • Energy Tips: We recommend energy-efficient models with voice on rebates.
  • Warranty & Support: We stand behind our work for years to come.

Conclusion

Hooking up a water heater isn’t merely a matter of installing a new tank. It’s a complete process that demands planning, professional competence, and adherence to regulations in your area. At Paradise Plumbing, we take charge of the whole ride: from choosing and permits to installation, testing, and ongoing support.

If your water heater is in trouble or on its last legs, contact Paradise Plumbing today for a free quote and consultation.

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