Call Our Experts Today! 608-399-4847


BEST OUTDOOR WOOD FURNACE Presented by NC 2015-03-16T15:09:04+00:00

We make it easy for you to buy a wood or coal furnace,
furnace parts, pex, water treatment or whatever else you might need.
We can ship it to you within days by credit card or check.
Your one stop shop where one call does it all!

Discover WHY we can say that.


We have a complete walkthrough of the NCB-250-COAL boiler which you can watch below.

Most important reasons why we are the

Our standard firebox is 1/4″ thick
– with the option of 3/8″ on our NCB-175 and NCB-250 models!
(only $200 more)

Our firebox is made out of high quality 1/4″ mild steel
That is why they don’t rust through, split, crack or warp!

Remember, the thicker the steel, the more the blower kicks in
to maintain the water temperature and the additional steel past 1/4″
(That is why we recommend using a 1/4″ firebox)

We don’t have ANY fancy electronics or circuit boards.

ALL of our parts are off-the-shelf parts,
that are available anywhere.
There’s nothing proprietary that you have to buy from us.

Many companies don’t have a forced air fan.
Others have a fan that blows air through
the front door into the side of the fire.

We took it one step further and have a fan in back,
that blows air up through the grates
and feeds oxygen into the bottom of the fire,
just like a blacksmith’s forge!

Our warranty covers parts AND labor!
Many warranties only cover parts or
you have to ship the furnace back to the manufacturer!

Make sure you don’t buy your furnace off of eBay.
An eBay outdoor wood furnace will not come
with the factory warranty and you
will not get the same customer service!

Manufacturer/Brand Firebox Thickness
Information taken from their website
Nature’s Comfort Offers high quality 1/4″ mild steel
along with the option to go 3/8″
Shaver Outdoor Wood Furnace Thicker than 1 Gauge! .427″
OVER 4/10th of an inch thick!
The Homesteader 7 gauge or approx. .1793″
Lil’House Outside Wood Heater 16 gauge .060″
Mahoning (approx 3 gauge) .250″
Hydro Fire 10 gauge .1345″
Hardy Uses both 14 gauge .0747″ and 16 gauge
(Firebox, Water Tank, Base, Ash Bin, and Doors)
Heatmor 10 gauge .1345″
Aqua Therm Models 275 and 345 have a 3/16″ (0.1875″)
model 145 has a 1/8″ .125″ (11 gauge)
Pro-Fab Industries
Empyre Wood Burning Furnace
10 gauge .1345″
Taylor Models 275 and 345 have a 3/16 (0.1875″) firebox,
and the model 145 has a 1/8 (.125″)
Bryan Furnace 1/4″ (.250″) and 10 gauge (.1345″) combo
Wood Master 1/4″ (.250″)
Central Boiler Their website only says “heavy gauge”
but forums say 1/4″ or .250″


We custom build every best exterior outdoor furnace for you,
so when you order you can specify
your choice of several great colors
and several other combinations!

Our best outdoor wood boiler is SO strong, we can suspend it from the top alone!
(where the circular hole is)
You can also lift the furnace with a forklift from the bottom.

This is how we move and load every one of them!!


Building Quality Wood Furnaces
Since 2006


Why buy a Nature’s Comfort Outdoor Furnace? NC The
We make it simple without a lot of expensive electronics to break NO
We make it user serviceable. Anyone can maintain our furnace! NO
We use a high quality Honeywell thermostat that is accurate and reliable! NO
We make our round firebox to last with few welds! Ours is a high quality mild steel that is 1/4″ thick! NO
We give accurate BTU ratings using an established scientific formula. NO
We have a motion detector light for on the front. NO
We have a fan not a simple damper to fuel the fire with oxygen. More complete burning Some
Our fan is in the back, behind a door, where you can’t get shocked AND
it blows the air through the grate into the bottom of the fire NOT
into the side of the fire! Fires burn from the bottom up, right?
We have been building high quality energy efficient furnaces since 2006! NO

best outdoor wood furnace

Our NCB-175 Best Outdoor Wood Furnace
Rated to Heat up to 4000 sq. ft.


If your buildings are insulated with good windows and you use a dry seasoned hardwood, your burn times are usually 12 to 24 hours depending on the temperature setting in your building.

Click on the picture for a larger image

Get the Bugs, Dirt, Wood and Smoke outside.
Your lungs will love you
and your Insurance Company will too!

Many people are getting lower insurance rates.

We feel we build the safest,
best wood furnace and coal furnace.

We have the BEST PRICES and
a Very Friendly Staff to help
you every step of the way.

Feel free to call Randy – (608) 399-4847

Extra large, waist high loading door.
No more bending over,
straining your back to load wood!
Lever action latch for easy closing and safety!
A PROVEN design!
ALL furnaces come with a motion light
for on the front for making wood
loading easier at night!
No switches.
No forgetting to turn it off.
If it’s dark outside and you go
near the best wood boiler,
it turns on!


Think the door’s not big enough?

The door is more than big enough
for anything you can lift into the furnace!27″ W X 25.5″ H for all of the G series boilers!
Click on Picture for a Larger Image


Having the chimney come down low,
stops the heat from going right out the chimney!

Our units also have firebrick which increases the efficiency to 78%
Click on Picture for a Larger Image

1/4″ Thick High Quality Mild Steel
Round Firebox With Few Welds

We also have a pullout ash pan!
Some other makers don’t even have an ash “pan”!!
That makes it HARD to clean out!
You have to let the fire die down
or move the burning wood aside
to scoop out hot ashes. OUCH!
Our ash pan is removable
and easily cleaned out by
simply pulling it out and
dumping the ashes.Few welds in the cylinder
that makes up the firebox
so it doesn’t weaken the structure,
break or warp.
It is made of a solid piece of tubular steel!
It will not RUST through with proper water treatment!
Will not split and crack like Stainless Steel
from the expansion and contraction!
Actual photo of a fire inside our firebox only minutes after reloading with wood!
Firebox size is 13.5 cu/ft (29.25″ Cylinder 36″D), 1/4″ thick.
It is totally surrounded with 175 gallons of water,
absorbing the maximum amount of heat possible!
The chimney is also surrounded by water,
capturing heat that would otherwise be lost!
The ash pan (and hot coals) are surrounded with water too!

Comes STANDARD with ONE Hookup with the option for heating FOUR zones in total for heating a Home AND a shop / garage / apartment / pool / hot tub and MUCH more!

Our units also come with a quality 3 speed pump that we preset to run continuous.  This is so you never have to worry about freezeup.

We use state-of-the-art Solar Guard insulation!

It has silverline backing on the back of the unit. We then insulate on top of that with R19 vinyl-backed fiberglass in the walls and ceiling!




The ash “pan” is removable for easily dispensing your ashes.  Many furnaces don’t even have an ash pan, so you have to let the fire die down or shove the burning wood aside to clean them out!  Water surrounds the ash pan as well, extracting all the heat from the red hot wood or coals.  The chimney is low on the firebox and exits about 1 foot from the bottom, so that the smoke – or more importantly, the heat – is trapped so that it doesn’t quickly escape out the flue.  That would be a big loss of efficiency.  This is also a better idea since you don’t have baffles getting a creosote buildup on them.  This also creates a 2nd burn chamber, to more completely burn the gases and wood!  When wood starts to burn, it’s the gas that burns first!  Another advantage is that the chimney exits through the water, further heating it up – for free!  Nothing does better!


We can heat a house with a water temperature of just 160-180 degrees. You burn less wood or coal!

Water jacket is made from high quality 3/16″ mild steel with a high quality 1/4″ mild steel round firebox.

< There is an air handler/blower that feeds air into the firebox, below the grate, to feed oxygen to the fire – just like a blacksmith does it. It is thermostatically controlled to keep the water at a set temperature that you can adjust.



 Click on Picture for a Larger Image


As you can see, the firebox is round.  Fires like round chambers better then square fireboxes.  They don’t like the voids of the corners.  The forced-air fan is in the back – feeding oxygen into the bottom of the fire – like a blacksmith’s forge.  The lower section is the ash receptacle.  You only have to clean it by simply pulling out the ash pan to dump your ashes – without disturbing the fire.  The firebox is totally surrounded by water.- top, sides, bottom, front and back!  You can see that the chimney goes up through the water, further extracting the heat.  Our chimney drops down in the firebox, trapping in the heat and gases, to maximize heat transfer and ensuring you’re not heating the outside air! This huge secondary burn chambers allows you to burn off all the gases that first ignite, when you throw in a new piece of wood. This is valuable heat, normally lost.

Click on Picture for a Larger Image
Our furnace is so strong and well-made, that the circular hook on top is strong enough to carry the weight of the furnace!
Exterior is made of Heavy Duty Metal Roofing – 29 gauge structural quality, full-hard steel.
10 layers of protective coating. It has a Lifetime film integrity Warranty for walls and roof and a 30 year warranty against fade and chalk. 10 year edge rust warranty against acid rain.There are legs on the bottom with a skirt surrounding the bottom to ground level.The chimney is made out of 1/4″ wall, schedule 40 pipe and is surrounded by water. It tops out at about 6 feet above ground. You can EASILY add an extension with standard 6″ stove-pipe
Click on Picture for a Larger Image to see hookup detail.These furnaces are shown with the door open for easier viewing!
Extra Large rear access door. All electrical items are in back, safely behind a door!
Water and electrical hookups.
The easiest furnace for the self-installer to put in!
Click on picture to bottom left to see hookup detail.
Single output shown to left but all units can hold as many as 4 pumps to heat up to 4 zones.
The blower in the back is a great aid in getting a fire started. It also recovers the water temperature much quicker, and burns the wood up more completely because oxygen is being fed to the bottom of the flame – like a blacksmith feeds his fire!


The air blower determines how hot the fire burns and therefore how hot the water gets.
A thermostat on the back of the water jacket tells the blower when to turn on and off,
so it doesn’t run all the time and waste wood..This is a LOT more efficient than a damper!
The air blows into the bottom of the fire, through the grate!
That’s better than blowing in from the front – into the side of the fire, as some others do.
You get more complete burning from a fire where the oxygen is fed through the bottom as opposed to blowing over the fire from the side, like others that have that big box on the door!


(items in this kit are listed to the right)

Installation Kit For Forced Air Contents

40′ – 1″ red PEX

20′ – 3/4″ red PEX

1     – 1″ MPT x PEX valve

1     – 3/4″ MPT x PEX valve

1     – 1 x 1 x 3/4 PEX T

3     – 1″ PEX x MPT fitting

2     – 1″ PEX x Fem Sweat fitting

2     – 1″ PEX couplings

12   – 1″ PEX cinch clamps

3     – 3/4″ PEX cinch clamps

1     – PEX cinch tool

4     – 1/2 gal boiler treatment

1     – Boiler Treatment Test Kit

1     – 20 plate water to water heat exchanger

1     – water to air heat exchanger

50′ – Platinum 3 Wrap Insulated red&blue 1″ Pipe

(pex pipe also has LIFETIME warranty!)The cost for the above kit is $1,100.00

Also, anything past the 50 feet of pex that is included, add $6.00/ft to the $1,100.00

Don’t forget a concrete pad, approx 3-4″ thick.  Also with our units, you do not need to put a hole in the concrete pad for the pex pipe. 

Start with a small piece of wood. Seriously, you can use these bigger, cheaper pieces or smaller ones – whatever you can easily handle. The bigger ones require less cutting and splitting.

ANY wood is cheaper than oil, gas and electricity! One person said that they have never used their propane heater after propane prices tripled!

flAMES Within a couple of minutes – literally – this fire was roaring!  This happens if you use a good dry seasoned wood!
Great News!
We have a coal series furnace with a shaker grate!.  You can watch the shaker grate in the video at the top of this page.
We have had a customer burning coal in his furnace the past 2 winters!
He puts 8-10 shovels in, about to the bottom of the door, heaping in the middle )about 9″.
This little bit will last him 12-16 hours he said!
He said that one of the advantages of coal are that it heats up faster.
He can come home late to a dead fire and the water cooled off and can have heat in 20 minutes!
The coal also lasts longer than wood. He often mixes wood, putting it on top of the coal and it works VERY well, he said.
He is heating a 3300 sq. ft house and a 1000 sq ft garage with 12 foot ceilings –
so an equivalent of 1500 sq. ft plus 3300 plus his hot water. 4800 sq. ft total.
The garage stays at 70 degrees even when it’s below 0 outside!
To top it all off, his furnace is 325 feet from his house!! He’s a happy camper…
Choose from a wide variety of colors for our NCB-80, 175, 250 & 325G boilers!
Retail prices listed include the standard colors of Evergreen or Charcoal. All other colors are an additional $100.00.


Questions about Stainless Steel answered

Do you build with stainless steel?

No, we don’t build stainless for several really good reasons.
Our furnaces last longer than stainless with MANY furnaces still in use from day one!!
1. Mild steel transfers heat better than stainless does.
2. Stainless is a great sales feature, but little else, since most companies use cheap stainless, like a car’s exhaust system.
There are many grades of stainless out there.
3. Since stainless is so expensive, the fireboxes are made really thin.
Some are no thicker than the metal in a 55 gallon barrel or the thickness of a trailer fender!!
That’s why you see so many split and broken apart.
4. Stainless is more prone to stress cracks, so why use it?
5. Unless the stainless is retreated after welding, you’ve lost all of it’s properties through the heating of the metal.
And it’s being welded to mild steel anyway, so what’s the use?
Like I said, it’s a great sales feature but our 1/4″ high quality mild steel furnace heats better, doesn’t crack and split – and lasts longer!
If stainless was better, we’d surely be using it.

The potential for electrical shock is something we have tried to totally eliminate.
That is why unlike our competitor’s stoves, our stoves do not have electrical control boxes, draft fans, etc., on the outside.
We believe these impose too much risk should a problem ever arise.
We also believe that to have anything too complicated on a wood furnace is unnecessary.
We have made our furnaces to be simple, and reliable and we have proven that over time.
We do not have complicated self-fill, or water level indicators on our furnaces.
They are simply things to wear out or malfunction requiring costly service and repairs.  These stoves were developed by us, for our own use.
We started making them for others slowly and now our stoves are well known nationally for their simplicity, and their maintenance-free operation.  We are sure that if you purchase one of our stoves you will be completely satisfied with our stove
throughout its long service life which you will enjoy.
Hot Water Wood Furnaces are indeed the very best heating choice.
We are positive that a few years down the road when others are making costly repairs to the overly complex system they purchased from one of our competitors, you will be quite comfortable and enjoying your new cost effective Nature’s Comfort Hot Water Wood Or Coal Furnace.
About us:
Currently located in Shipshewana, IN, Nature’s Comfort was started in Lancaster, WI by Dave Nyhof and his son Eric in November, 2006 stemming from a passion for alternative energy and inventing that was developed during Dave’s 30 years in the residential home building industry.
Beginning with inventing a corn furnace for his own use after frustration of his family not being able to keep their current one functioning, Dave started selling another brand of outdoor wood furnaces soon after.
After not being able to fulfill orders due to manufacturer problems not keeping up with demand, Dave designed and built his own unit simply to fulfill orders, obligations and to better meet the expectations of quality from his customers.
The NCB-175 and NCB-250 were the first models built and the backbone of what made for additional models to be added throughout the years as more and more requests came in for varying heating demands.
The NCB-325 started production in 2007 and the NCB-120 in 2008 with the 325 being replaced by the 325G in 2009 as well as many improvements and modifications to all the NCB models.
The largest advances were made in water flow for the greatest efficiency with the addition of using Solid Works computer software with a Flow Express module for visually seeing where water and air were actually flowing. Controls were also greatly improved and designed to be simple for installation, operation, troubleshooting and replacement.
2009 brought the GT-220 for high efficiency, downdraft gasification smokeless burning and in 2010 Nature’s Comfort moved to Shipshewana, IN to be centrally located and close to the fabrication plants in the heart of Amish country with their strong work ethic and pride in the quality of their work.
Continually striving to offer more products for the alternative energy market, the NC-40 pellet stove was added to the product lineup early 2010 with the NC-30 following later in the year.
2012 brought solar water heaters with the SM-H60 designed for use in conjunction with an outdoor boiler and the SM-V30 filling applications as a standalone unit.
Also added in 2012 was the NCB-80 and replacing the GT-220, the EPA Phase II qualified GT-6000 with all products holding to Nature’s Comfort’s desire to offer cost effective alternative energy products that are heavy duty yet simple designs for the easiest installation, operation and maintenance.