Add On Wood Furnace Advice

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timeuser

New Member
Hearth Supporter
Sep 2, 2009
11
Missouri
Hi all, I'm new here.

I'm looking to put in an add on wood furnace to supplement, and mostly replace the use of my propane furnace. I'm in a 1200 sq ft ranch style with an unfinished basement where the furnace would go. The propane furnace is in the basement and has ductwork all run and I was thinking ideally I could hook into that existing ductwork with a wood furnace with blower. There's already a separate chimney at the end of the house that was used with a wood furnace up until 15 years ago or so. So far after reading a bit on here and looking around online I've been considering the Caddy Add On furnace that qualifies for the tax credit or possibly the Englander 28-3500 which I could pick up at the local Lowe's. I'm not sure if perhaps either of those may be bigger than what I need though.

Any advice or suggestions about what I'm thinking or alternatives you think I should consider would be much appreciated. Thanks!
 
Hi timeuser. Welcome to the Boiler Room.

Your plan sounds like a good one. There are details you will want to get into as you get closer to making a decision about which furnace to buy, the best way to install it, etc. My only question upfront is: what shape is the chimney in? I assume it's lined. You'll get a fair amount of creosote with most wood furnaces, so you will need to good strategy for chimney maintenance and cleaning. You should be able to pipe the hot air output into your existing ducting. You may or may not need to draw combustion air from the outside, but it's something to plan for in case you do need to do it.
 
I figured the chimney was my first thing to make sure was good. It is a stacked cinder block type with 8" round clay tile liners. It's 18' from bottom to top. I've looked into it with a flashlight and looked at the outside and it looks okay to me, but I think I need to have someone check it out and make sure it isn't cracked anywhere for sure. A friend suggested the possibility of lining it with insulated two walled stainless steel to be safer and more efficient but if it's not cracked maybe that's overkill? I'll have to check the size on my existing furnace and look at the chimney some more later today.

Thanks a lot guys!
 
I was in the same boat you are last December. I was tired going through so much propane. I bought a US Stove 1557M from my local Tractor Supply for $1050 and with $20 worth of black 6" stove pipe, dampers and misc accessories i was up and running in about 4 hours.

My old farmhouse has an interior chimney, an unfinished basement, and I utilized the existing 'card/fiberglass' duct board. To get me through the winter, i just sucked in the cooler basement air to my blowers-but this year i'm building a cold air return/filter box that will be tied in to the return trunk line.

I have a few guys at work that have my same stove an we are all happy with it. Out of curiousity, how much of a tax credit do you get?
 
The 2009/2010 tax credit is 30% for stoves that meet the efficiency requirement which it appears the Caddy does. That would make it close to the same cost as the 28-3500 which doesn't.

My existing furnace is an 80,000 BTU Trane XE90 so it seems to be similar in size to the 28-3500 BTU-wise, the Caddy looks to be rated around 100,000 BTU which is a little bigger. How close of a match do you guys think I should ideally be sizewise?

I'm gonna talk to my brother about the ductwork, sizing and such also, he does HVAC and installed the gas furnace and duct we have. But it's really nice to be able to have a conversation like this with some people with experience as I think it all through and figure it out.
 
I have a Yukon that I am very happy with, and I think I read that they now also qualify for the tax credit. My propane usage for a 4800 sq ft house with ok insulation from last November to now has been less than 250 gallons (for hot water, and as backup for the yukon when I am out of town).

I have a superjack, with only 1200' you could go with the smaller one.

I like the superjack because it has over 8 hour burn times, even burning in an uninsulated garage. As I am finishing and insulating the garage this fall I expect even better burn times. It took me most of the winter to get those burn times though, there is a learning curve.

Even though I like mine, if it was set up in an insulated area, I think I would have been happy with any of wood furnaces that have an electric motor that runs the air supply and is regulated by a thermostat. Given the uninsulated garage, I am really glad I got the yukon.
 
I have a 1950 hotblast (Caddy). It would run you out of the house. The units are well built, do qualify for the tax credit and are the only EPA certified furnaces on the market right now. They sell a smaller furnace called the Mini caddy which also qualifies for the tax credit and is EPA Certified. Its a furnace that will produce 75,000 btus of heat. This would be more of a size that you would need. Either way both have a nice glass door. The downfall is price, but you get a higher combustion furnace. There are other furnaces out there that do qualify for the tax credit, but beware that coal is not a biomass fuel. Therefore not qualifying for a tax credit. Another option is the new blaze king woodfurnace. It has a catalyst in it and it rated around 48,000 btus. Like said you don't need the full btus at the same time. If you can afford it, I would recommend an upgrade. Also if the chimney is sound, lining it would be a good idea. Here is some links.

(broken link removed to http://www.psg-distribution.com/product.aspx?CategoId=16&Id=374) Mini Caddy

(broken link removed to http://www.blazeking.com/Manuals/New-Manuals-2009/OM-APEX) E V1.01.pdf Blaze King

Good luck with whatever you choose.
 
From what I understand, talking to the dealer with whom I have my Blaze King on order from, they shipped out 20 of the new furnaces already. It would be nice to hear from someone who got one of those and get a report back on how critical that 13% moisture content is. I think I read that Blaze King does not use hardwood for their evaluations, so who knows how good old oak will work at 18-20% moisture

Herbster
 
The blaze king has post heated air on the catalyst. I'm sure that would help remove anything after the fact. 18 to 20% I would think shouldn't pose any issues. There also is a new furnace for energy king that is currently in the works for an EPA certification, and also has the tax credit. The Blaze King, Caddy, Energy King, and others operate on a thermostat with natural draft. Start a fire, load them and set the thermostat and walk away.
 
i have a 28-3500 englander ,a very nice furnace for the money it heats my 2,000 sq ft house great in the coldest january nights and is quality built with nice features ,but having a secondary burn would be nice especially for less wood use and longer burn times .it seems with the new tax credits and the benefits of a epa rated furnace i would be looking for a caddy if i was in the market for one today .sure theres some furnaces out there that have a secondary burn ability in some form but they are basicly the same unchanged furnace sold back in the 70's .the caddy looks to be a clear modern step above the others no doubt
 
You beat me to it. Those prices include shipping.
 
Can somebody tell me how this tax break thing works. Do you get an actual guaranteed refund, or is it a deduction at the end of the year?

So when all is said and done, this PSG would be $1650 give or take from Dynamite buys?
 
You have to watch. The manufacturers will say consult a tax advisor. And they aren't liable for the ability to achieve tax credits. The way I have taken it when reading is, you get your certificate. When you file your taxes you get 30% back in the form of a credit. If you were getting 2000 and you filed your furnace, you may get 2600 back. I'm no tax expert, but this is the way I read it. I know I qualify due to my unit being EPA certified, not exempt. Basically its a buyers beware as far as I see it. Also the credit applies to wood only. I talked with energy king about their furnaces. If you buy the forced draft and install shaker grates to their new furnace, you do not get the credit, for it then would be a coal furnace. There are only a select few furnaces that qualify for the tax credit. You would pay full price now for the furnace, then come tax time you would get 30% back up to 1500. Considering you haven't used it on anything else. Its good for the 2009 2010 tax years. Also you cannot get it in new construction. You must be replacing a unit to qualify. Here is some reading material.

http://www.dynamitebuys.com/taxcredit.php
 
Also, as I understand it, the tax credit applies basically as a credit against the taxes you actually owe (up to $1500 off) and can include the cost of installation. That's better than a write off which just reduces your taxable income. However, if you didn't make very much money this year and you therefore didn't owe much in taxes, you wouldn't receive any more of the rebate than you owed total in income tax. But you'd have to have a pretty small income to owe less than $1500 in taxes!! You claim your credit when you file your taxes and keep your certificate and documentation of expenses etc. like any tax papers in your files for in case you get audited or whatever.

I hope I didn't just make that more confusing. ;-)
 
So it's a tax credit, not a deduction. Thanks, I understood what you said. Now do I keep my Woodchuck 526 or take advantage of this tax credit and score the PSG Caddy?
 
I bought my furnace before even knowing about the tax credit. I didn't use that as a tool to purchase a new furnace, but to upgrade to a cleaner burning more efficient unit. Just then I realized I qualified for the credit which was a bonus. I'm looking forward to using less wood. I've had a few small fires in my furnace and its amazing how clean it burns. I had a raging fire in the firebox, and could touch the flue pipe on the unit. With the credit, and selling your old furnace it would be tempting. Thats what I'm doing.
 
theres a dealer near me (hes in titusville Pa.)selling the larger caddie epa furnaces for just over 2 grand and he delivers to your house and installs them in your basement .he says they are selling like crazy and the new owners are in love with them.
 
Rural king here in Ohio sold out of them and said the same thing. I've heard nothing but good about them. I'm hoping to get a video of mine in operation here when it gets cold out. I did have a small northern light video on my cell I recorded from my 4th breakin fire.
 
Get that guy up here! They want over 3500 just for the unit up here from my local dealer! Obviously, they don't want any business on these things.
 
Does that unit have oil or electric on it? 3500 sounds high if not.
 
Nope, just the add on. They are high on everything. Everyone else around here seems to be too. Not sure why?? They probably figure people are going to spend more if they are getting the tax credit.
 
Getting back on the chimney discussion--round tile liners sound good. If there arent' any big cracks or other problems, it should be good to go as is. It's technically a Class A chimney, which is the spec for all woodburning appliances.

You may find it desirable to line it at some point with stainless steel, as you suggest. SS is safer and easier to clean, though not cheap. If I were you, I'd go with what you've got and see how it works this winter. If you have problems with creosote buildup or draft issues, consider upgrading to an insulated ss liner.
 
I have a Caddy Add-On, and it worked great last year. Do a search for some of my posts in this section of the forum, and you can read up on them.

With regards to your chimney, the 8" would probably be too much draft for the Caddy, unless you install a barometric damper to moderate the draft. I've found that with the Caddy, unless the draft is right, the heat is going to go up the stack. Be sure that you, or your installer uses a manometer to check the actual draft, and adjusts to specification - don't guess these ones.

As for the ductwork and interconnection to the other furnace's blower, you should be fine.

Hope this helps!
 
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