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DIY Hydronic Oven
Use your outdoor wood furnace to power this water (hydronic) oven.
Water Oven Overview
Our Outdoor Hydronic Wood Furnace is the primary heat for my home and domestic water. When I built our addition, I installed an extra pump on the wood furnace and ran radiant heat in the floor of the addition. This floor heat has no thermostats, actuator valves, or any other automation. So I need to operate the valves manually to control hot water flow (it's cheaper that way). I designed the window seat to hide the manifolds, while providing access to the valves. When I discovered the amount of heat given off from the manifolds, that got the old wheels-a-turnin'; The Water Oven was born.
I normally run my wood boiler at 185°, but to achieve "cooking" temperatures of 165°+, I raised the boiler setting to 195°. But 185° does fine when reheating foods. Please use a thermometer for your food, as bacteria is a concern if your food doesn't reach 165°, I'm told.
I am going to assume you can meet the following conditions to construct your own Hydronic Oven:
1. You have a working Hydronic (Water) Furnace. Mine just happens to be powered by wood.
2. Your water lines from the furnace are insulated. If your water temp is 185° at the furnace, it should be 185° at the manifold in the house. A lower temperature will affect results.
3. You have, or can obtain, the knowledge of how to work with PEX tubing, as most of the hydronic systems use PEX. This requires cutting, crimping and fitting knowledge, all of which are available on various internet sites.
4. You have, or can obtain the skill to "sweat copper." I learned how from YouTube, to do this project.
See the Hydronic Video Below:
And now for my Public Service Announcement:
If you'd rather use a microwave to reheat you food, than this may not be for you. But realize that when you microwave your food, you're destroying and damaging your food molecules, plus forming new radiolytic compounds. Microwaving in a plastic container releases carcinogens into your food, making matters even worse.
This water oven is more like a crock pot slow cooker, powered by your outdoor wood furnace.
The wood furnace pump uses 78 watts, and is going to be running anyway.
Why not leave that 1100 watt microwave turned off?
I use our Hydronic Oven nearly everyday.