Wood Heaters – Radiant or Convection?

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Re: Wood Heaters – Radiant or Convection?

Postby offgridQLD » Wed Jul 15, 2015 10:51 am

Well we finally after a few years of stuffing about purchased a wood heater (get it in a week or two) . We were looking at the Nectre bakers over but for yours they only made the one model for smaller homes up to 140m2. I was looking about on the net and noticed they had updated there webpage. I also noticed they now have a BIG bakers oven that will pump out about 22kw and is large enough for our main open plan living area. Not to mention the actual oven section on the bottom is much more generous. More like the size of a typical modern oven.You can also cook on the top of it but I don't see myself doing much of that (well no stir frys in the lounge anyhow :lol: ) Just nice to have something cooking over winter on special occasions.

Though I like that in a SHTF situation I'm not reliant on gas or even our offgrid electric system for cooking.

Its over 200kg and I need to get a base made up for it and install it. Should have a good 5m or so of flue so should draw well. The flue will be exposed for the first 3m to the ceiling and vents will be installed above it to duct/transfer heat to two other rooms when needed.
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Re: Wood Heaters – Radiant or Convection?

Postby Cherokee Solar » Thu Jul 16, 2015 9:16 am

offgridQLD wrote:Its over 200kg and I need to get a base made up for it and install it


Hi Kurt,

My unit looks almost exactly like the one in the photo and being way down in the SE corner and up in the mountains where it is as cold and misty and cloudy this winter as I can ever remember here - that thing earns its keep. It hasn't been warmer than 5 degrees for days and days on end and the sun is missing in action. I'm barely making 2kWh - 3kWh/day here. Batteries at 65% full this morning - I've had to cut back severely. :? What's going on? :? Still, extreme conditions are useful as they test your systems. It is very toasty in the house though. :D

Yes, they are very heavy units and an el-cheapo trolley will fall apart if you attempt to use one to move it around. It took five people to lift it up the stairs at the front of the house. A better quality trolley will move it no worries, but use an el-cheapo at your peril - the axle broke on mine even though it was rated to 250kg! (cheap rubbish - so I picked up a solidly built one to replace it).

The base if installed over a timber floor is made up of thick fibro cement sheet with floor tiles. Screw the fibro sheeting to the floor. You also have to be aware of the distance between the wall and the wood box and leave enough tiles at the front of the box to ensure that your nice timber floors don't get burnt by things falling out of the wood box from time to time. Just sayin...

Cheers

Chris
Off grid solar + hot water. Heavily insulated + owner built flamezone house BAL-FZ. 300 mixed fruit trees + herbs + flowers + vegetables. Bees + heritage chickens. High up in the mountains north of Melbourne. http://ferngladefarm.blogspot.com.au/
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Re: Wood Heaters – Radiant or Convection?

Postby offgridQLD » Thu Jul 16, 2015 9:38 am

You might have the original smaller bakers overn (that's if its a nectre brand) is the air controlled with a big round knob that you turn like an old safe dial?


I have a little trolly made from RHS 3mm x 40x40 ss that has several caster wheels designed to move pianos and slate pool tables. Plan was to use the jib on the tractor to lift it off the trailer and lower it onto the trolly on the back deck using heavy ply sheets to get a smooth rolling surface . Then I am on the same level as the lounge room floor.

The installation manual lists 15mm cement sheet minimum with 300mm in front and 200mm each side. Rear clearance is 125mm min.

I'm more concerned about damaging- cracking-scratching the tile area that it sits on. Though I have had some heavy things (slate pool table) moved across some of my tileing jobs in other homes in the past without issue.

Most likely will just get it installed ready for QLD summer....on well

Kurt
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.
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Re: Wood Heaters – Radiant or Convection?

Postby Cherokee Solar » Thu Jul 16, 2015 11:20 pm

Hi Kurt,

No it looks almost exactly like the unit in the photo. It is made by Thermolux and is the Gourmet cooker.

Yes, 15mm Fibro is the way to go. I didn't manage to crack any of the tiles but we were all very careful when moving the monster, but the timber floor (19mm Sydney Blue Gum tongue and Groove over timber joists and bearers) is pretty solid too and I added extra joists under that point in the floor to support the load - you can never be too careful.

Yeah, 15mm flooring plywood should take the load easily, but don't let the span be too far without it being supported underneath.

Good luck and let us know how it goes. It looks like a good unit.
Off grid solar + hot water. Heavily insulated + owner built flamezone house BAL-FZ. 300 mixed fruit trees + herbs + flowers + vegetables. Bees + heritage chickens. High up in the mountains north of Melbourne. http://ferngladefarm.blogspot.com.au/
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