Frequently Asked Questions

Where Are You Located? Do You Have A Show Room?

At this time, we do FREE heating and venting consultations by email and phone, choosing to forgo a traditional retail show room business model.

From your digital photos, we can determine what venting components you will need, and we can work with you and/or your installer by phone to ensure that your installation is both safe and beautiful. Your order(s) will be drop-shipped to your door from the manufacturers via FedEx Ground, Freight, and/or UPS.

Doing business online is an act of trust for all parties involved and we want you to have your questions fully addressed before making an investment, so that you feel comfortable. We are here to help. Call us today for your free heating and venting consultation:  1.877.463.4004

Still unsure? We hope you’ll feel differently after you visit our testimonial page to read what our clients and manufacturer have to say about

We love our clients and we appreciate your support!


How Many Square Feet Can A Katydid™ or Kimberly™ Heat?

In determining which wood stove is best for your needs, one should consider not only the heat output of the wood stove but also the heat retention of your space, as well as your own personal expectations. In other words, are you comfortable at 68-degrees or is 75-degrees more to your liking?

While Unforgettable Fire, LLC states that Katydid™ can heat up to 2500 square feet and Kimberly™ can heat up to 1500 square feet, we recommend that you consider the following variables when making your purchasing decisions:

  • Local climate and weather conditions.
  • Square footage and ceiling height of your space.
  • Insulation in your walls and attic.
  • Window quality.
  • Location of your wood stove within your space.
  • Air movement & humidity levels within your space.
  • Wood species and wood moisture content of your fuel.

As well, your investment in a moisture meter with an accuracy of +/- 1% can be made for less than $50 and it will help to ensure you are getting the most heat from the least amount of wood, and the longest possible burn times.


What Is The Expected Burn Time In Katydid & Kimberly™?

Unforgettable Fire, LLC approximates burn time as being up to 10 hours for Katydid™ and up to 8 hours for Kimberly™, from coal bed to coal bed. Based on our own experience with both stoves, we feel that Unforgettable Fire’s estimated burn time is accurate.

In other words:

  • Will you wake up to active live flames in the morning? {No}
  • Will you wake up to a warm stove and chimney and live coals, making it easy to get your fire going again? {Likely yes, depending on fuel}

The species of wood and the moisture content in your cordwood will play a large role in the expected burn time and heat output from any wood stove; this is not unique to the Kimberly™ and Katydid™ wood stoves.

For example, while Douglas Fir and pine will produce a hot fire, these species will burn to ash far quicker than hard woods such as oak, hickory or maple. Likewise, a high moisture content in your cordwood will produce less heat and more creosote than a low moisture content. For maximum heat output, always burn wood that is 20% moisture or less as verified by a moisture meter.

If you choose to burn extruded sawdust logs, your results will vary by brand, as the size, shape, and amount of pressure that the logs are formed under varies from manufacturer to manufacturer.

The temperature in your home when you wake up in the morning will be determined by your home’s ability to retain heat, which can be affected by one or more variables below:

  • Local climate and weather conditions (temperature, wind speed, humidity, etc.).
  • Square footage and ceiling height of your space.
  • Insulation in your walls and attic.
  • Window quality and number of windows.
  • Location of your wood stove within your space.
  • Air movement & humidity levels within your space.
  • Wood species and wood moisture content of your fuel.

Because dry, seasoned wood will produce more heat, burn longer, and produce less creosote than wood containing greater than 20% moisture content, your investment in a moisture meter with an accuracy of +/- 1% can be made for less than $50 and it will help to ensure you are getting the most heat from the least amount of wood.

How Do I Vent Your Wood Burning Stoves?

The Kimberly™ wood stove is approved to use 3-inch double-wall stainless steel pellet stove pipe with a Class-A passthrough.The Katydid™ wood stove is approved to use a 4-inch double-wall stainless steel pellet stove pipe with Class-A passthrough. A Class-A passthrough is typically a cathedral ceiling support box or thimble  with double wall insulated or triple wall air-cooled Class-A pipe passing from the ceiling through the attic and roof.

This unique venting system saves owners hundreds of dollars in installation costs, often as much as $1200 – $1500 in savings, simply because pellet stove pipe is far less costly than using Class-A chimney pipe for the entire length of the chimney, as other wood stoves require. This savings helps to balance out the cost of the stoves, making total installation costs similar for a wood stove selling at half the cost.

See our Kimberly™ and Katydid™ Owner’s Manuals for installation instructions appropriate to your application. Never follow installation instructions which may be provided by pipe manufacturers.

Can I Vent Out A Wall, Instead of Through The Roof?

Whenever possible, always vent your Kimberly™ or Katydid™ gasifier wood stove up through the ceiling and roof, rather than out the side wall like a pellet stove.

You will notice in the Katydid™ and Kimberly™ Owner’s Manuals there is no approved installation for a through-the-wall installation.

 A warm chimney is a happy chimney! Venting out the wall (instead of going straight up through the ceiling) exposes the more of the flue to outside air, which can cool the chimney and thereby negatively impact the chimney’s performance, and ultimately the stove’s performance. To overcome this cooling effect, one would need to insulate the flue and the cost of installation would increase substantially.

As well, horizontal runs with elbows put back pressure on the venting system, which can cause difficult starts and smoke spillage when opening the door for reloading.

In effect your your chimney is the “lungs” of your wood stove installation and your Katydid™ or Kimberly™ is the “heart” of your installation. Just as your heart can not function properly if your lungs to not provide it with sufficient oxygen, neither can your Katydid™ or Kimberly™ wood stove.

In Roger Lehet’s 31 years of cleaning, selling, installing and now manufacturing wood stoves, he has always preferred to vent straight through the ceiling and roof whenever possible. Although there are few instances where this becomes impossible due to construction of the house, this is rare and should be avoided.

Are Your Wood Stoves EPA Certified?

Our Katydid™ and Kimberly™ wood stoves are EPA Certified. In addition, both Katydid™ and Kimberly™ are EPA certified for use in Washington State, which has some of the most stringent emission standards in the United States.

Kimberly™ provides an  exceptionally clean burn, emitting 3.2 grams/hour in EPA testing, as compared to 7.5 grams/hour allowed by Federal EPA standards, and 4.5 grams/hour allowed by Washington State standards. Katydid™ provides an even cleaner burn, emitting 1.9 grams/hour in EPA testing and is one of the very few EPA Certified wood stoves which currently meets the new emissions standards for the Year 2020.

Both Katydid™ and Kimberly™ wood stoves are also non-catalytic, making the EPA emissions rating even more remarkable.

Which Is Better, A Catalytic or Non-Catalytic Wood Stove?

Given the very nature of catalytic wood stoves, they are perhaps more suited to people who enjoy gadgets and technology, and are sufficiently disciplined to maintain a catalytic wood stove properly, so as to maximize performance and longevity. Even then, catalytic elements, when spent, must be disposed of, causing an unnecessary burden to our landfills.

In catalytic wood stoves, smoke flows through a coated ceramic honeycomb device, contained within the firebox, where smoke particles and gases ignite and burn. This is comparable to the catalytic converter on your car. Even though catalytic stoves are capable of producing long, even heat output, there are many disadvantages to this technology.

First, many owners of catalytic wood stoves find that they need to “babysit” a catalytic wood stove until it heats sufficiently to activate the catalytic element.

Second, if at any time a catalytic wood stove is over-fired, or fueled with inappropriate material (such as treated wood or household trash), the catalyst may fail in as little as two years. Compare that to the six years which can be expected from a well maintained catalytic stove using only appropriate fuels.

Even under the best of conditions the catalytic element will degrade, and require replacement, which is not inexpensive. Burning paper printed with colored inks or a stray nail ends up in the combustion chamber will render the catalyst immediately useless.

Third, the mining and processing of catalytic elements is costly to the environment, not to mention there are the political considerations and risks of mining the catalytic elements in the volatile Middle East.

Katydid™ and Kimberly™ are non-catalytic wood stoves. Unforgettable Fire, LLC has developed the means to get catalytic action from a non-catalytic stove by use of gasification and proprietary technology.

Our non-catalytic Kimberly™ gasifier wood stove was EPA certified at 3.2 grams per hour particulate, well under the Washington State emissions standards of 4.5 grams/hour. Even more remarkable, our Katydid™ gasifier wood stove was EPA certified at 1.9 grams/hour, making Katydid™ one of the cleanest wood burning stoves available today and not only meeting, but exceeding the EPA emissions standards for the Year 2020.

What Kind Of Fuel Can I Burn In Your Wood Stoves?

Katydid™ and Kimberly™ are wood stoves and have been designed to burn regular cordwood, although given the size of their fireboxes, cordwood should be cut shorter than for stoves with larger fireboxes.

As well, many people burn extruded logs because they are convenient. However, never burn sawdust logs which contain waxes or paraffins.

Remember to always burn wood that has 20% moisture content or less, as verified by a moisture meter. Hard wood that has been well seasoned will produce far more heat and far less creosote than soft wood or wet wood.


What Size Logs Can I Burn?

Kimberly™ can accommodate one log of 4-inches across and 9.5-inches in length, however, once there is a coal base on top of the grate, the vertical space will be reduced and it will be necessary to burn shorter pieces of wood.  Therefore, I like to cut wood from 4-inches to 6-inches in length and stack smaller pieces on top of one another. Katydid™ can accommodate a log up to 8-inches long if placed horizontally inside the combustion chamber. Katydid™ can accommodate a longer long of perhaps 10-inches if placed vertically or at a diagonal

While you may make more cuts with a chainsaw firewood to accommodate the sizes of our smaller fireboxes, in the end it is possible that you will experience less work overall, as the shorter pieces of wood are easier to split and the Katydid™ and Kimberly™ wood stoves user their fuel wisely.

Why Are Your Wood Stoves Better Than Pellet Stoves?

Pellet stoves are self-feeding by use of electricity (with one exception, that is gravity fed). For this reason, pellet stoves may provide a more consistent room temperature than a wood stove would. This, we believe is where the advantage of a pellet stove ends.

When the grid goes down due to a winter storm or long term emergency which makes electricity unavailable, a pellet stove will fail you in your greatest hour of need. As well, a pellet stove will hold you hostage to the availability and affordability of pellets.

Your fuel options are much greater with a Katydid™ or Kimberly™ gasifier wood stove. With no  moving parts to wear out or otherwise fail, and no electricity required to start or otherwise operate, your Katydid™ or Kimberly™ gasifier wood stove is more apt to keep you warm in your greatest hour of need.

For many families the charm in having a wood stove over any other heating appliance is not only the warm glow of the flames, but its versatility and reliability.

What Is The BTU Output Of Your Wood Stoves?

By definition, a British Thermal Unit (BTU) is the amount of energy needed to heat one pound of water by one degree Fahrenheit. BTU’s are commonly used to describe the energy content of fuels and are used as a loose standard of comparison for the heat output from heating appliances such as propane furnaces and wood stoves.

While BTU/hour ratings may be fairly consistent when shopping for propane furnaces, BTU/hour ratings mean little when shopping for a wood stove.

In theory, one would think that wood stoves with a higher BTU/hour rating would produce more heat than lower rated units. However, BTU/hour test protocols do vary, causing a great deal of confusion for the general public. Therefore, to fully understand a particular wood stove’s BTU/hour rating, one must first understand the test protocol which produced it.

First of all, it is critical to realize that the EPA test protocol for wood stoves was established to measure emissions, not a BTU/hour heat output. The EPA emissions test protocol is standardized to burn milled pine lumber of the same size, shape, and moisture content, relative to the size of the firebox for each stove. The EPA emissions test protocol requires that each stove’s draft control be set to its lowest and smokiest setting.

Therefore, the BTU/hour measured during an EPA emissions test will always be lower than what would be produced if burning a firebox full of seasoned hardwood fueled by oxygen from a more open draft. It is for this reason that the following disclaimer appears on every EPA label in upper case letters:


It is therefore misleading for one to compare the BTU/hour heat output of one wood stove against another wood stove, because the BTU/hour ratings are not the subject of the EPA emissions test, and are therefore not trustworthy. Furthermore, other test protocols are not standardized.

Comparing BTU/hour ratings on wood stoves would be like comparing apples to oranges and oranges to bananas. While they are all fruits, they are all very different from one another.

What’s The Manufacturer’s Warranty On Your Wood Stoves?

Unforgettable Fire, LLC offers a five-year, non-prorated warranty to the original purchaser of a Katydid™  or Kimberly™ wood stove heater on all parts, except for replacement glass, replacement gaskets, replacement grate/ash pan covers, misuse or abuse, or improper installation. At its sole discretion, Unforgettable Fire, LLC will either repair or replace any defective unit to the original purchaser under these terms. The original purchaser shall be responsible for all shipping and handling costs associated with any warranty claims.

How Is A Gasifier Wood Stove Different From A Rocket Stove?

Katydid™ and Kimberly™ are gasifier wood stoves, not rocket stoves.

When a Katydid™ or Kimberly™ wood stove is dampered down, the fuel maintains an approximate 450-degree Fahrenheit temperature as it burns, thus creating massive amounts of smoky gases. As the smokey gases rise to the top of the combustion chamber in a Katydid™ or Kimberly™ wood stoves, the gasses ignite and burn at a very high temperature.

The bulk of the heat produced in our Katydid™ and Kimberly™ wood stoves comes from the secondary combustion process, which produces a very efficient and clean burn, with very little smoke emitting from the chimney.

While rocket stoves burn very hot and very clean, they are not efficient. Rocket stoves are hungry and consume lots of fuel.

When Will The Optional Accessories Be Available?

The optional Cobb Oven & Grill is currently available for purchase. We anticipate that the Stove Lite™ thermo-electric lantern available for purchase in early 2016.

A thermo-electric generator is being developed for Katydid™ and Kimberly™. However, we have no information on a release dates or pricing at this time.

Because the accessories are optional additions and will work on the stove that you currently own, you can confidently buy your Katydid™ or Kimberly™ wood stove without delay. Unforgettable Fire, LLC is not a believer in planned obsolescence as other manufacturers are.

Kindly contact us to be notified as accessories become available for purchase.

Why Are Your Stoves So Costly?

It is a common misconception that our Katydid™ and Kimberly™ gasifier wood stoves are more expensive than other choices. When you consider your TOTAL installation costs to install a Katydid™ or Kimberly™ gasifier wood stove vs. any other EPA Certified wood stove, Katydid™ and Kimberly™ look like a much better value.

Katydid™ and Kimberly™ are approved to vent with pellet stove pipe with an appropriate Class-A passthrough. All other EPA Certified wood stoves require Class-A chimney pipe for the entire length of the chimney, which costs about $100 per foot. As well, many other wood stoves require a Type II hearth pad for thermal protection, averaging around $500.00. Katydid™ and Kimberly™ require ember protection only and thus the hearth pad is far less costly.

You can spend your money on a Katydid™ or Kimberly™ gasifier wood stove — or you can spend your money to install a less expensive wood stove but one which requires more expensive venting and hearth pad. In the end, your TOTAL investment will be about the same. See the Katydid™ or Kimberly™ Owner’s Manuals for installation details.

Furthermore, our clients report that they can heat their homes with one-third to one-half the amount of wood required by their previous wood stoves simply because our stoves gasify the wood first, and then burn the wood gases, squeezing more heat from less wood. With the cost of firewood, in terms of $$$ to buy it or time to cut and split it, doesn’t it make sense to buy a Katydid™ or Kimberly™?

 Brand “X” Wood Stoves vs. Katydid™ Stoves

$2050  BRAND "X" Wood Stove $3995 Katydid™ Wood Stoves
$1500 Class-A Chimney Pipe († Estimated) $450 Chimney Pipe († Estimated)
$500 Floor Pad (Estimated) $100 Floor Pad (Estimated)
$450 Shipping & Handling (Estimated) FREE Shipping & Handling
$4500 TOTAL Investment $4545 TOTAL Investment

† Estimated costs for a single story residential application will vary according to the construction of your home and placement of your stove. Expect to incur additional costs for a 1-1/2 story or 2 story installation.

 Brand “X” Wood Stoves vs. Kimberly™ Stoves

$2050  BRAND "X" Wood Stove $3995 KIMBERLY™ Wood Stoves
$1500 Class-A Chimney Pipe († Estimated) $450 Chimney Pipe († Estimated)
$500 Floor Pad (Estimated) $50 Floor Pad (Estimated)
$450 Shipping & Handling (Estimated) FREE Shipping & Handling
$4500 TOTAL Investment $4495 TOTAL Investment

† Estimated costs for a single story residential application will vary according to the construction of your home and placement of your stove. Expect to incur additional costs for a 1-1/2 story or 2 story installation.