Over time, the coil can become clogged with mineral deposits or corroded, leading to reduced hot water output and lower efficiency. If your boiler is struggling to provide enough hot water, it might be time for a tankless coil replacement.
This guide will walk you through the signs of a failing coil, the replacement process, and tips for maintaining your new coil to ensure long-lasting performance.
Signs You Need a Boiler Tankless Coil Replacement
Before replacing your tankless coil, check for these warning signs:
Inconsistent or Insufficient Hot Water – If your hot water runs out quickly or doesn’t get hot enough, the coil may be clogged with mineral buildup.
Slow Recovery Time – A functioning tankless coil should heat water almost instantly. If it takes longer than usual, replacement may be necessary.
Leaks Around the Coil Area – Corrosion or a failing gasket can lead to water leaks around the coil’s mounting area.
Rusty or Discolored Water – If you notice brown, red, or yellow water, the coil might be corroding internally.
High Energy Bills – A clogged coil forces the boiler to work harder, increasing fuel consumption and energy costs.
Tools Materials Needed
Before starting the replacement process, gather the following tools and materials:
? Tools:
- Adjustable wrench
- Pipe wrench
- Screwdriver set
- Wire brush
- Bucket (for draining water)
- Teflon tape or pipe sealant
- Allen wrench (if required)
? Materials:
- New tankless coil
- New gaskets and bolts
- Descaling solution (for cleaning)
How to Replace a Boiler Tankless Coil
Step 1: Shut Down the Boiler
- Turn off the power – Switch off the boiler’s electrical supply at the circuit breaker.
- Shut off the water supply – Close the valve that feeds water into the boiler.
- Allow the boiler to cool – Wait at least 1-2 hours before working on the unit.
Step 2: Drain the Boiler
- Connect a hose to the boiler’s drain valve and place the other end in a bucket or drain.
- Open the drain valve to release water and relieve pressure.
Step 3: Remove the Old Tankless Coil
- Locate the coil housing on the side or top of the boiler.
- Unscrew the bolts securing the coil plate to the boiler.
- Carefully pull out the old coil and remove the old gasket.
- Clean the mounting surface with a wire brush to remove rust and debris.
Step 4: Install the New Coil
- Position the new gasket in place to create a proper seal.
- Insert the new tankless coil into the boiler.
- Secure it with new bolts, tightening evenly to prevent leaks.
- Apply Teflon tape or pipe sealant to the fittings for a leak-free connection.
Step 5: Refill and Test the Boiler
- Close the drain valve and refill the boiler with water.
- Open the water supply valve and check for leaks around the coil.
- Restore power and turn on the boiler.
- Run hot water from a faucet to ensure proper heating.
Maintenance Tips to Extend Coil Life
To prevent future issues and extend the life of your new tankless coil:
Flush the Boiler Annually – Helps remove mineral deposits that clog the coil.
Use a Water Softener – Reduces scale buildup, especially in areas with hard water.
Check for Leaks Regularly – Inspect connections and gaskets for early signs of wear.
Monitor Water Temperature – If hot water becomes inconsistent, the coil may need cleaning or servicing.
When to Call a Professional
While replacing a boiler tankless coil is manageable for experienced DIYers, you should call a professional if:
You notice excessive corrosion or damage inside the boiler.
The coil housing is stuck or difficult to remove.
There are persistent leaks after installation.
You are unsure about handling boiler components safely.
Replacing a boiler tankless coil is an essential maintenance task that restores hot water efficiency and reduces energy costs. By following these steps and practicing regular maintenance, you can ensure your heating system runs smoothly for years to come.
If you’re not comfortable performing the replacement yourself, don’t hesitate to call a licensed HVAC technician for professional assistance!
