It’s vital that the stack always stay above 300 – otherwise condensation will form.

BUYER BEWARE!!!!!!!FYI everyone. Greenwood is out of business as of 3/31/09. The Aspen was actually made by a company in Manitoba. They refused to do business with Greenwood early this year. They will still make the boiler on their own. After 2 years of fighting with Greenwood to fix my Model 100, greenwood slipped out the back door before refunding my money leaving me $7k in the hole and with a useless boiler. MIserable people who hopefully never do business again.

Hi Everyone, Mark here – the creator of the video… I understand the Greenwood dilemma and worry too for many businesses today – even GM and Chrysler. Regarding the Aspen Series 175 and 350 – no real problem – just a hiccup, as I announced here 1 month ago, the Pro Series 200 and 400 are the OE/Manufacturers solution to our market as they (Pro-Fab) made them for Greenwood to market and sell. As for your GW 100, many are happy when they just back to the basics of hydronic design and good fuel.

If you need more BTU output, you could also take a look at the central boiler e classic. It has 3 times the BTU output per the EPA tests. I have been operating this unit for the past year and I am pleased with the operation. There is a bit of learning that needs to take place to optimize the burn process.

I should mention is that even though I did most of the install myself I did have a pro- do the final stages of the install and he did a few things extra that the manual did not mention ..like installing a switch to shut the circ pump off at low water temps in the wood boiler if I ran out of wood so the Buderus oil burner that is my back up heat didn’t warm up the outside temp. the guy that did my install knew what he was doing ,anyone who has a problem with a Aspen has installed it wrong.

How many face cords of wood is everyone burning? I heat 2100 sf and want to be able to heat my attached dbl garage when I want to work out in the garage. How many cords would I be looking at burning Thanks in advance

My house is 3400 sq ft plus a 1000 sq ft attached garage, this winter in Alaska it got pretty cold in Fairbanks my boiler did very well but I must say my house also has a 5 star energy rating though. As far as cleaning the ports I think if you burn good wood you don’t have to clean it but once every few weeks BUT the plastic rod that it comes with is a little weak. I hope the EPA rating helps me out ! The tree huggers are raising a stink about the wood boilers in Fairbanks.

Profab now has the Pro Series 200 (same as 175) and the Pro Series 400. For 4000 sqft you might be happier with the 400 but again – much goes into the sizing. See our web site for these sizes. Hope all this helps. Thanks!

Regarding the 4000 sqft - it depends on whether you are in South Carolina or Northern NY – We service these extremes with over 1000 homes. Our technical staff can do a heat loss analysis for a small fee but roughly – I wouldn’t want to heat more than 2000 sqft in Lake Placid if poor-fair insulation or more than 6000 sqtf in Hilton Head if well insulated so there are our extremes (roughly!). I clean the tubes every 8 weeks but we burn 18 month seasoned wood. Respect any gasifier with good fuel.

We bought a greenwood boiler last year and it has worked great so far but I am seeing some issues like the block on the inside of the door is cracking I think the door might be warping?? And there is a huge discoloration on the back along the bottom of the box the paint looks burnt?? I don’t know who to talk to and it would be interesting to find out about the switch for the pumps when the temp in the box is low as described in an earlier response. am a rookie But it sounds like you guys know what you are talking about. The heat output seems great but as for efficiency it is hard to know what I should be expecting.