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expiredearthdogmonster posted Dec 07, 2025 11:41 AM
expiredearthdogmonster posted Dec 07, 2025 11:41 AM

Costco Members: Firman 2900W / 3200W Peak Electric Start Dual Fuel Inverter Generator

+ Free Shipping

$300

$600

50% off
Costco Wholesale
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Deal Details
Costco Wholesale has for Members: Firman 2900W Running / 3200W Peak Electric Start Dual Fuel Powered Inverter Generator (WH02942F) for $299.99. Shipping is free.

Thanks to community member Cwhomer for finding this deal.
  • Note: Please see the original post for additional deals & give the WIKI and additional forum comments a read for helpful discussion.
Product Details:
  • The Firman WH02942 is a portable, RV-ready generator designed for quiet, efficient power on the go. With 3,200 starting watts and 2,900 running watts on gasoline, or 2,900 starting watts and 2,600 running watts on propane, it gives you flexibility and reliability in any situation.
  • 171 cc dual fuel engine with low oil shut off and cast iron sleeve
  • 1.8 gallon tank provides 9 hours of runtime. Propane tank not included
  • RV ready multi feature control panel with covered outlets
  • 5.5" Heavy Duty Never-Flat wheels and High Leverage U-shape Folding Handle
  • Largest tank in industry with extended run-time (less re-fueling).
  • Quiet muffler (Whisper Series) with USDA FS certified spark arrester.
  • 3-in-1 Data-Minder monitors running hours, voltage and frequency in conjunction.
  • Bonus accessories including engine oil, oil funnel, tool kit, battery float charger, LPG regulator/hose and battery charge cable.
  • Included battery for your convenience.
  • Limited lifetime warranty.

Editor's Notes

Written by RevOne | Staff
  • Offer valid from 12/7/25 through 12/13/25, while supplies last.
  • If you don't have a Costco Warehouse Membership, you can sign-up here.
  • Our research indicates that this deal is $150 less (33% savings) than the next best available price from a reputable merchant with prices starting from $449.99 for Certified Refurbished units at the time of this posting.

Original Post

Written by earthdogmonster
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for Members: Firman 2900W Running / 3200W Peak Electric Start Dual Fuel Powered Inverter Generator (WH02942F) for $299.99. Shipping is free.

Thanks to community member Cwhomer for finding this deal.
  • Note: Please see the original post for additional deals & give the WIKI and additional forum comments a read for helpful discussion.
Product Details:
  • The Firman WH02942 is a portable, RV-ready generator designed for quiet, efficient power on the go. With 3,200 starting watts and 2,900 running watts on gasoline, or 2,900 starting watts and 2,600 running watts on propane, it gives you flexibility and reliability in any situation.
  • 171 cc dual fuel engine with low oil shut off and cast iron sleeve
  • 1.8 gallon tank provides 9 hours of runtime. Propane tank not included
  • RV ready multi feature control panel with covered outlets
  • 5.5" Heavy Duty Never-Flat wheels and High Leverage U-shape Folding Handle
  • Largest tank in industry with extended run-time (less re-fueling).
  • Quiet muffler (Whisper Series) with USDA FS certified spark arrester.
  • 3-in-1 Data-Minder monitors running hours, voltage and frequency in conjunction.
  • Bonus accessories including engine oil, oil funnel, tool kit, battery float charger, LPG regulator/hose and battery charge cable.
  • Included battery for your convenience.
  • Limited lifetime warranty.

Editor's Notes

Written by RevOne | Staff
  • Offer valid from 12/7/25 through 12/13/25, while supplies last.
  • If you don't have a Costco Warehouse Membership, you can sign-up here.
  • Our research indicates that this deal is $150 less (33% savings) than the next best available price from a reputable merchant with prices starting from $449.99 for Certified Refurbished units at the time of this posting.

Original Post

Written by earthdogmonster

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Top Comments

whodiini
1677 Posts
387 Reputation
I have owned this for several years. The positive is that it is extremely reliable and works well. The negative is that it is tricky to start, so it took me some time to figure out the subtleties of starting. I suspect the negative reviews all have to do with people who havent spent the time to understand this part. For those people, I would recommend a battery supply. I use propane because it runs cleaner. I dont use it except for extended power failures.

So here are the subtleties in starting it. First the battery dies if connected up and unused for a while. You need to connect it up to test it at the beginning and it requires you to open the front panel. So what I did was to remove the battery and replace the leads with RV type leads. Then make a connector with RV type leads to the spade leads of a battery, which I keep charged by using it in a UPS. You absolutely need a live battery to start with propane because the valve on the propane gas connection is electrically powered, which you need to plug into the front panel once the battery is connected. Second, the manual pull start only works with gas and not propane WITH A DEAD BATTERY, so there is no other option if you want to run with propane and your battery is dead. As a poster pointed out, pull start works if your battery is not dead, but electric start also works if your battery is not dead. Once I did that, it starts like a champ whenever I need it. BTW, removing the battery and replacing it is a pain, which is why I used the external connection - dont need to remove the front panel to connect and disconnect the battery between uses.

My extended backup plan for now is a battery backup to run a refrigerator and microwave, network and computer, plus TV and a few lights for several hours. Then if it goes beyond that, use the generator to recharge the battery backups, since that only takes an hour to recharge then.. In the future, I may just get a transfer switch for a few circuits in the house and the heater. My current strategy works fine in the summer and around a day in the winter. After a day in winter, it starts getting pretty chilly at night, which is why a transfer switch is in the future.
FloridaKevin
590 Posts
177 Reputation
Seriously, read those reviews. Those people seem very incompetent, one review says they "hired two guys to unpack it, set it up and get it started and NOTHING!" I feel sorry for this company since they are getting a bad representation of this generator. The main issues seem to be with the units arriving with dead batteries or an oil leak. While those are very important issues, it seems the complainers are simply used to everything working 100% when in reality, a generator that is this mass produced is bound to ha e some issues, that's what the warranty is for.
beckfiveoh
63 Posts
26 Reputation
Propane is stable indefinitely and it doesn't carry the same issue of potentially gunking up a carburetor if fuel is left in the generator for extended periods of time. There is a reduction of output power with propane however, as it's labeled on the generator as to what to roughly expect on gasoline vs. propane.

161 Comments

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Pro
Dec 07, 2025 04:06 PM
11,533 Posts
Joined Jul 2008
c2nah777
Pro
Dec 07, 2025 04:06 PM
11,533 Posts
Quote from Thebudman :
This looks like the same one I bought used off Amazon a few years ago. I have 4 generators and this one is a great generator and I have no complaints. You have to connect the battery while setting up for first use. If not, your battery will not work and you might think it is dead.
IFTFY
Of course, we also need to add the oil. And RTFM. Thanks for the tip. Repped.
Dec 07, 2025 04:07 PM
3 Posts
Joined Nov 2025
mtbsam68Dec 07, 2025 04:07 PM
3 Posts
Quote from Cpshell1 :
Damn, this is a great deal and would be an awesome power backup should my trailer batteries need a top off while boondocking. Unfortunately, it' about 2 inches too high to fit in my trailer pass thru. The search continues.
I have a champion one that I have to roll on it's side and then stand up once through the opening. It's not that difficult to do. I also only run on propane so no gas to spill. You may be able to do something similar.
1
Dec 07, 2025 04:11 PM
622 Posts
Joined Jan 2009
Stunner2xxDec 07, 2025 04:11 PM
622 Posts
Is there a reason why people here are on propane instead of gas?
2
Dec 07, 2025 04:12 PM
179 Posts
Joined Jan 2022
CreberaDec 07, 2025 04:12 PM
179 Posts
Quote from Cpshell1 :
Damn, this is a great deal and would be an awesome power backup should my trailer batteries need a top off while boondocking. Unfortunately, it' about 2 inches too high to fit in my trailer pass thru. The search continues.
Can't you remove the wheels and plastic shroud, should fit then?
Dec 07, 2025 04:14 PM
245 Posts
Joined Oct 2006
C_KentDec 07, 2025 04:14 PM
245 Posts
Can you attach solar panels to this for unlimited power?
3
1
Dec 07, 2025 04:21 PM
179 Posts
Joined Jul 2017
Moscar80Dec 07, 2025 04:21 PM
179 Posts
Quote from Cpshell1 :
Damn, this is a great deal and would be an awesome power backup should my trailer batteries need a top off while boondocking. Unfortunately, it' about 2 inches too high to fit in my trailer pass thru. The search continues.
I was thinking the same thing, but still have an unopened powermate (red version of the generac) 2200 in the box from over 4 years ago. Bigger tank and lesser runtime kind of makes me feel ok on passing since my continuous power needs are about 1400 watts so doable on a 2200 watt unit with less fuel consumption. Warranty is nice though.
Dec 07, 2025 04:23 PM
1,677 Posts
Joined Jan 2006
whodiiniDec 07, 2025 04:23 PM
1,677 Posts

Our community has rated this post as helpful. If you agree, why not thank whodiini

I have owned this for several years. The positive is that it is extremely reliable and works well. The negative is that it is tricky to start, so it took me some time to figure out the subtleties of starting. I suspect the negative reviews all have to do with people who havent spent the time to understand this part. For those people, I would recommend a battery supply. I use propane because it runs cleaner. I dont use it except for extended power failures.

So here are the subtleties in starting it. First the battery dies if connected up and unused for a while. You need to connect it up to test it at the beginning and it requires you to open the front panel. So what I did was to remove the battery and replace the leads with RV type leads. Then make a connector with RV type leads to the spade leads of a battery, which I keep charged by using it in a UPS. You absolutely need a live battery to start with propane because the valve on the propane gas connection is electrically powered, which you need to plug into the front panel once the battery is connected. Second, the manual pull start only works with gas and not propane WITH A DEAD BATTERY, so there is no other option if you want to run with propane and your battery is dead. As a poster pointed out, pull start works if your battery is not dead, but electric start also works if your battery is not dead. Once I did that, it starts like a champ whenever I need it. BTW, removing the battery and replacing it is a pain, which is why I used the external connection - dont need to remove the front panel to connect and disconnect the battery between uses.

My extended backup plan for now is a battery backup to run a refrigerator and microwave, network and computer, plus TV and a few lights for several hours. Then if it goes beyond that, use the generator to recharge the battery backups, since that only takes an hour to recharge then.. In the future, I may just get a transfer switch for a few circuits in the house and the heater. My current strategy works fine in the summer and around a day in the winter. After a day in winter, it starts getting pretty chilly at night, which is why a transfer switch is in the future.
Last edited by whodiini December 7, 2025 at 10:53 AM.
9

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Dec 07, 2025 04:23 PM
36 Posts
Joined Nov 2021
MemorableGiraffe479Dec 07, 2025 04:23 PM
36 Posts
How long would something like this last?
Dec 07, 2025 04:30 PM
63 Posts
Joined Jul 2012
beckfiveohDec 07, 2025 04:30 PM
63 Posts
Quote from Stunner2xx :
Is there a reason why people here are on propane instead of gas?
Propane is stable indefinitely and it doesn't carry the same issue of potentially gunking up a carburetor if fuel is left in the generator for extended periods of time. There is a reduction of output power with propane however, as it's labeled on the generator as to what to roughly expect on gasoline vs. propane.
Dec 07, 2025 04:30 PM
18 Posts
Joined Apr 2010
shabooDec 07, 2025 04:30 PM
18 Posts

Our community has rated this post as helpful. If you agree, why not thank shaboo

Quote from pthomas11 :
Does anyone have this? Was going to bite but recent reviews make it seem like they are 3-4 year old units with reliability issues.
I have the non-dual fuel version and it's been rock solid since 2021. I do the maintenance on it myself (it's simple stuff) and run two in parallel to feed my house. You can't get 240v out of these units but it can run a good amount of 120v loads on very minimal gas. During the last hurricane I used about 4.5 gallons a day and it ran a fridge, two freezers, ac window unit and lights and outlets without a hitch.
1
Dec 07, 2025 04:34 PM
166 Posts
Joined Jul 2011
pleasejasonDec 07, 2025 04:34 PM
166 Posts
that's a steal! i paid full price several years ago and have no regrets. it's been a reliable backup power source when the utility company shuts down the grid.
Dec 07, 2025 04:37 PM
56 Posts
Joined Nov 2021
Gml999Dec 07, 2025 04:37 PM
56 Posts
Quote from Stunner2xx :
Is there a reason why people here are on propane instead of gas?
storing propane is safer than gas. gas degrades somewhat quickly. power output and runtime is less when using propane compaired to gas. I have a gas pressure washer and keep a gallon of fuel for it. when that gas sits for more than a month I dump it in my truck and buy new fuel. Old gas and small engines are not a good idea. ethanol free gas if you have it available is the way to go...
Dec 07, 2025 04:47 PM
1,149 Posts
Joined Oct 2015
BobertbosunDec 07, 2025 04:47 PM
1,149 Posts
I have this and love it. It came with a charger cord that I'll hook up ahead of a nasty storm. No issues starting and I've used plenty of garbage ethanol gas
Dec 07, 2025 04:49 PM
681 Posts
Joined Jun 2012
C17chiefDec 07, 2025 04:49 PM
681 Posts
Quote from beckfiveoh :
Propane is stable indefinitely and it doesn't carry the same issue of potentially gunking up a carburetor if fuel is left in the generator for extended periods of time. There is a reduction of output power with propane however, as it's labeled on the generator as to what to roughly expect on gasoline vs. propane.
Not to mention supply. Maybe not so much propane, but natural gas on the tru fuel ones. For example if using for home backup and you have gas, and an outdoor tap for like say a grill or something or just put a dedicated on in, you can just attach a line to your gas service and run indefinitely vs storing or later finding gasoline to keep it going.

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Dec 07, 2025 04:57 PM
15 Posts
Joined May 2010
Rumast21Dec 07, 2025 04:57 PM
15 Posts
Quote from whodiini :
I have owned this for several years. The positive is that it is extremely reliable and works well. The negative is that it is tricky to start, so it took me some time to figure out the subtleties of starting. I suspect the negative reviews all have to do with people who havent spent the time to understand this part. For those people, I would recommend a battery supply. I use propane because it runs cleaner. I dont use it except for extended power failures. So here are the subtleties in starting it. First the battery dies if connected up and unused for a while. You need to connect it up to test it at the beginning and it requires you to open the front panel. So what I did was to remove the battery and replace the leads with RV type leads. Then make a connector with RV type leads to the spade leads of a battery, which I keep charged by using it in a UPS. You absolutely need a live battery to start with propane because the valve on the propane gas connection is electrically powered, which you need to plug into the front panel once the battery is connected. Second, the manual pull start only works with gas and not propane, so there is no other option if you want to run with propane. Once I did that, it starts like a champ whenever I need it. BTW, removing the battery and replacing it is a pain, which is why I used the external connection - dont need to remove the front panel to connect and disconnect the battery between uses.My extended backup plan for now is a battery backup to run a refrigerator and microwave, network and computer, plus TV and a few lights for several hours. Then if it goes beyond that, use the generator to recharge the battery backups, since that only takes an hour to recharge then.. In the future, I may just get a transfer switch for a few circuits in the house and the heater. My current strategy works fine in the summer and around a day in the winter. After a day in winter, it starts getting pretty chilly at night, which is why a transfer switch is in the future.
Do you have a picture or link on how to do this? Sounds like a good idea.

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