Connecting Two Water Heaters: A Comprehensive Guide

Connecting two water heaters together can be an effective solution for increasing hot water capacity or providing redundancy, ensuring a continuous supply of hot water for your home. This guide will walk you through the process step-by-step, from gathering the necessary materials to testing the system after installation.

Materials Needed

Two water heaters Copper or PEX piping Shut-off valves Teflon tape or pipe joint compound Pipe fittings (elbows, tees, etc.) Pipe insulation Soldering tools (if using copper) Wrenches and other basic plumbing tools

Steps to Connect Two Water Heaters

Step 1: Turn Off Power and Water Supply

If your water heaters are electric, turn off the circuit breakers. For gas heaters, turn off the gas supply. Shut off the main water supply.

Step 2: Drain Water Heaters

Attach a hose to the drain valve of each water heater. Drain them completely to ensure there is no water left inside.

Step 3: Decide on Configuration

Parallel Configuration: This is common for increasing hot water supply. Both heaters will operate simultaneously. : One heater will preheat the water for the second heater. This configuration is useful when space constraints are an issue or for specific applications.

Step 4: Install Shut-Off Valves

Install a shut-off valve on the cold water supply line going to each heater. This allows you to isolate each heater for maintenance.

Step 5: Connect Cold Water Lines

For parallel configuration, connect the cold water line to both heaters using a tee fitting. For series configuration, connect the cold water supply to the first heater, then connect the outlet of the first heater to the cold inlet of the second heater.

Step 6: Connect Hot Water Lines

For parallel configuration, connect the hot water outlets from both heaters back to the main hot water line using tees. For series configuration, connect the hot outlet of the first heater to the cold inlet of the second heater.

Step 7: Insulate Pipes

Insulate any exposed hot water pipes to reduce heat loss.

Step 8: Check for Leaks

Before turning the water back on, double-check all connections to ensure they are tight and properly sealed.

Step 9: Refill Water Heaters

Open the cold water supply and allow the heaters to fill. Keep the hot water taps open to let air escape.

Step 10: Power On

Once filled, turn on the power to the electric heaters or the gas supply to the gas heaters.

Step 11: Test the System

Check for leaks and test the operation of both heaters. Adjust the temperature settings as necessary.

Safety Considerations

Always follow local plumbing codes and regulations. If you are not comfortable with plumbing work, consider hiring a professional plumber.

By following these steps, you can successfully connect two water heaters together. Regularly monitoring the system after installation will ensure everything is functioning properly and efficiently, providing a reliable source of hot water for your home.