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Hot tub water heater

 
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Hi guys.

Looking for some advise on the position of the “Baffle plate” in my water heater.

In the images below you can see the green baffle plate in two different positions.

Normal wood stoves have them open at the front (just above the door) but feel this is to bring the heat to the front of the stove, hence heating up the room.

As I want as much heat to stay inside my fire box, would moving through baffle opening to the back be better? Hopefully heating more of the steel that’s in contact with the water?

Also wanted to check if placing fire bricks on the door would help keep the heat inside the fire box?

Many thanks Morten.
CE105765-AA77-4B91-8992-449E3477CFD0.jpeg
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Hi Morten....Welcome to Permies!

It has been my understanding that the baffle was often positioned so that the flame path would be directed to the front which helps to keep the glass clean during the burn and be able to see it better too for viewing pleasure.

Not sure if you are in the planning stages or actually have a stove built and putting on the final details, but thought I'd also mention that there are very efficient rocket hot water heaters that are being built by DIYers also. One of which is here: Walker boiler
 
Morten Nielsen
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Gerry Parent wrote:Hi Morten....Welcome to Permies!

It has been my understanding that the baffle was often positioned so that the flame path would be directed to the front which helps to keep the glass clean during the burn and be able to see it better too for viewing pleasure.

Not sure if you are in the planning stages or actually have a stove built and putting on the final details, but thought I'd also mention that there are very efficient rocket hot water heaters that are being built by DIYers also. One of which is here: Walker boiler



Hi. Thanks for the feedback and great forum. . This is going to be working as a thermosiphon system heater next to the hot tub, so kind of took the design from Chofu heaters and made it my own a little.
So it is going to be a home build. No window in the door, so I think I will set the baffle to open at the back of the burner and hopefully get some secondary burn going aswell.  

Cheers Morten.
 
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Keep in mind that wood stoves use the front baffle opening as a place to introduce secondary combustion air AND then clean the glass on the door. Perhaps a rear baffle opening could be used to introduce secondary combustion air and then help clean the heat exchanger wall.??
Also, I’m not sure there’s much point having water under the stove?! I could be mistaken. Added volume? Thermosyphon?  
 
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Jeremy Baker wrote:Keep in mind that wood stoves use the front baffle opening as a place to introduce secondary combustion air AND then clean the glass on the door. Perhaps a rear baffle opening could be used to introduce secondary combustion air and then help clean the heat exchanger wall.??
Also, I’m not sure there’s much point having water under the stove?! I could be mistaken. Added volume? Thermosyphon?  



Hi.

Added underneath as it’s still a warm area and would be wasted Heat exchange if exposed to the air :-)

Going to add fresh air to top of baffle with pipes to hopefully get some secondary burn. So holding thumbs.

Thanks for the feedback 🙏🏻
 
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