Heating Domestic Hot Water Using An Outdoor Furnace

Did you know you can useĀ an Outdoor Wood Burning Furnace to heat your domestic hot water, for FREE!
According to EnergyStar, your water heating system accounts for 14% of your energy bill.

Monetarily speaking, the average household spends $400-$600 per year on water heating.

To reduce this expense, lower standby losses, such as heat that escapes the water heater and seeps into the surrounding basement area, as well as the amount of hot water you use in your home.

When set too high, or at 140 degrees Fahrenheit, your water heater can waste anywhere from $36 to $61 annually in standby heat losses, and more than $400 thanks to overall consumption. Lower that expense by bringing the heater’s thermostat to 120 degrees Fahrenheit or below.

However, if you chose to heat your domestic hot water with a Nature’s Comfort Outdoor Wood Boiler, you can totally eliminate that huge hot water bill 12 months of the year, saving up to $600/year, if you choose to run the furnace year round. If you run it 6 months of the year, when you are providing heat for your home, saving you $2-300 a year minimum!

For a sidearm heat exchanger, the hot line from boiler must first go to the top side port. This creates twice the domestic water flow through the sidearm as opposed to coming in at the bottom side port. For the fastest recovery, install a small circulation pump on the domestic side that is controlled by a strap-on thermostat or thermal snap disc placed on bottom line on the domestic side. Hookups to the domestic side must be connected to the drain and pressure relief ports. You cannot use a sidearm if the pressure relief port is on top of the water heater tank. The domestic side will not thermal siphon properly and will frequently air lock as well.

Make sure to keep drain & pressure relief in service & purge all air from piping and sidearm or it will air lock.


The plate HX drawing shown is for a pre-heater setup. Leave utility energy on for this to maintain the water temperature. As water is used it will then be heated by the plate HX for unlimited hot water. You may also use a plate HX to bypass the water heater entirely for on-demand operation.

Always use a mixing valve to prevent scalding water temperatures.

heating domestic hot water

Example of using a 20 plate heat exchanger to heat domestic hot water

Your hot water heater will stay off all winter while you enjoy a virtually endless supply of free hot water! This saves you $30 – 60 a month depending on what kind of heat you have and how much hot water you use.

Your hot water heater functions as normal in the summer and is always there as a backup.

Many of our customers tell us that they find it impossible to use all of the hot water that our system will produce

Your hot water heater is kept constantly full with hot water.

You can use an outdoor wood burning furnaceĀ for heating domestic hot water.

Wood Heating Solutions LLC

(608) 519-4664