We’ve encountered our fair share of water heater challenges, and let’s just say that the traditional tank models aren’t always the most efficient solution for today’s homes. When we install a tankless water heater ourselves, we’re not just saving on professional fees—we’re taking control of our home’s energy efficiency. It’s a project that might seem intimidating at first, but with the right preparation and tools, you’ll be surprised at what you can accomplish. So what makes this upgrade worth the effort?
Preparing Your Home for a Tankless Water Heater
Preparation is truly the cornerstone of any successful DIY project, especially when it comes to installing a tankless water heater.
We’ll need to check that your gas supply line can handle the higher BTUs—most tankless units need an upgrade from 1/2-inch to 1-inch lines.
Before we start, turn off the main water supply and drain the old unit completely.
Open a hot water faucet to relieve pressure while draining.
We’ll also need to verify your water pressure doesn’t exceed 80 psi and install a pressure relief valve if needed.
Don’t forget to check local building codes for vent requirements and gather all necessary tools and materials!
Removing Your Old Water Heater Safely
With our preparations complete, it’s time to tackle the old water heater that’s been loyally serving your home.
Safety comes first, so let’s remove it properly by following these steps:
- Turn off the water supply to prevent leakage during removal—if there’s no dedicated shut-off valve, you’ll need to close the main.
- Shut off the gas supply and disconnect any power to the unit.
- Drain the old water heater completely using a heat-rated hose while opening a hot water faucet to release pressure.
- Disconnect the water and gas lines (union fittings make for easier removal) and document existing connections for reference.
Mounting and Connecting Your New Tankless Unit
Now that your old water heater is out of the way, it’s time to install that sleek new tankless unit you’ve been excited about. First, we’ll need to construct a mounting box using 2×4 lumber and plywood, securing it with masonry anchors that can handle the weight.
| Component | What To Do | Materials | Tips | Safety Check |
|---|---|---|---|---|
| Mounting | Build sturdy box | 2×4s, plywood | Follow manufacturer instructions | Secure all anchors |
| Gas Line | Connect properly | Thread sealant, shut-off valve | Install sediment trap | Leak check connections |
| Water Lines | Connect hot/cold | Copper piping | Deburr before soldering | Test pressure |
| Relief Valve | Install after hot outlet | 150 psi rated valve | Required by code | Prevents explosions |
| Testing | Check all connections | Soapy water solution | Turn on slowly | Safety first! |
Gas Line and Venting Requirements
Gas line upgrades are probably the most critical aspect of your tankless water heater installation.
We’ve found that proper gas supply is non-negotiable for these high-BTU appliances.
Here’s what you’ll need to focus on:
- Upgrade your gas line from 1/2-inch to 1-inch to handle the 90k-130k BTU requirements of your tankless gas water heater.
- Install a gas shut-off valve, tee, and sediment trap for safety and code compliance.
- Set up direct venting using stainless steel vent pipe or PVC (check manufacturer’s instructions) with heat-resistant silicone sealant.
- Test for gas leaks using soapy water or a detector before firing up your system.
Testing and Finalizing Your Installation
Once you’ve connected all the plumbing, venting, and gas lines, it’s time to bring your tankless water heater to life.
We’ll start by turning on the water supply and opening a hot faucet to purge air from the system until water flows steadily.
Next, conduct a thorough leak test on all water connections.
When you’re ready for the gas supply, bleed the lines and use a soapy solution to confirm no leaks exist.
Finally, plug in your unit, follow the manufacturer’s start-up procedures, and adjust temperature settings to your preference.
Test multiple faucets to guarantee consistent hot water delivery throughout your home.
Congratulations on finalizing your tankless water heater installation!
Frequently Asked Questions
Can You Install a Tankless Water Heater Yourself?
We can DIY install tankless water heaters for cost savings, but we’ll need specific tools, knowledge of water flow, local codes, and safety precautions. Beware of warranty issues and common mistakes affecting energy efficiency.
What Is the Downside to a Tankless Water Heater?
We’ve found tankless water heaters have significant downsides: higher initial cost, complex installation requirements, demanding maintenance needs, and potential hot water supply limitations during simultaneous use, despite their energy efficiency and space savings.
Is There an IRS Tax Credit for a Tankless Water Heater?
Yes, we’re able to claim federal tax credits of up to 30% (capped at $2,000) for energy efficient tankless water heaters, offering long-term savings while supporting eco-friendly home improvements.
Do You Need a Plumber or Electrician to Install a Tankless Water Heater?
We recommend hiring professionals for tankless installations. Plumbers handle water flow, gas line connections, and plumbing requirements while electricians guarantee proper electrical connections. Installation permits and local codes mandate safety precautions that affect cost considerations.
