Vertical Corner Heater - Condensing / No Chimney

[gadget]

I currently already have a heater I'm working on for the greenhouse but I also want to get started on the new heater for upstairs in the house. This project will be slow going but I figured keeping a thread going will keep things progressing.

The plan is for a heater in the corner of the living room. The burn box will be steel plate lined with ceramic fiber board. The CFB will have a face coat where wood will contact it for abrasion resistance. Its a classic wood stove firebox design with a stepped ceiling with ceramic honeycomb secondary air diffuser plates. The fire is drawn into an insulated cyclone. The gases then go to a bell that sits on top with copper water heating coils then a heat exchanger made of welded steel pipes for heating room air. Then the flue gases go down through a heat exchanger for warming secondary air. Then it goes to a bell under the heater where more water is heated then off to the garage to the final heat exchanger and finally to the blower and out the PVC exhaust. No chimney. It is partially designed around materials I already have on hand.

Please share any thoughts or ideas.

Side View

[gadget]

This will be the condensing portion of the heater that will be in the garage. The goal is to use very cold outside air to cool down the final flue gases below 50F on cold days. It is a double stacked plastic HDPE barrel setup. Top barrel has many copper pipes that are in water. This water is circulated through a car radiator and is cooled by the incoming air that feeds the heater. The lower barrel captures the condensing water collecting in the copper pipes and also from the lower part of the heater that drips in from the pipe passing through the wall. The blower pulls the flue gases through the whole system and out the PVC exhaust pipe. There is a pump in the lower barrel to move the water collected to the drain.

The blower uses 80 watts on high
Each pump uses about 15 watts

The 3rd portion of this heater is the hot water circulation system. I'm still working on that layout. 

[gadget]

This is a very complex looking heater so far on paper. I'm thinking of maybe switching the copper condenser in the water barrel over to air/air. It would eliminate the top barrel, a water pump, and the radiator. Plus the weight of all that water is a problem. I'm just concerned about efficiency.

I did a cardboard layout of the fire box that is dimensionally sized from what I can use from a large thick steel plate I have. It is also sized around a 3" slab of CFB I have for the fire box base. Ignore the opening in the back. Its not part of the design