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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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Dec 08, 2025 06:14 PM
459 Posts
Joined Aug 2011
scott_tigerDec 08, 2025 06:14 PM
459 Posts
Any idea how long will a 20 LB Propane tank last if I only use a refrigerator and freezer. Trying to figure out if I need to buy more tanks.
Dec 08, 2025 06:19 PM
6,748 Posts
Joined Dec 2004
TroublestylistDec 08, 2025 06:19 PM
6,748 Posts
For those of you with this unit, any advice on the best power level to run at? I'm going to use it to recharge my power stations, so I can choose to run it at quiet mode, quick mode, or most efficient mode. Ideally the most efficient is also quiet, which I'm guessing would be around 1500w on propane?
Dec 08, 2025 06:27 PM
980 Posts
Joined Jul 2007
new_berlinDec 08, 2025 06:27 PM
980 Posts
is this literally for use during a black swan type event meant to sit in the garage ideally never to be used?

also would a small solar station be better to get as a first setup ?
Dec 08, 2025 06:34 PM
1,677 Posts
Joined Jan 2006
whodiiniDec 08, 2025 06:34 PM
1,677 Posts
Quote from LGNF :
The new generator comes with a power adapter for charging the battery if needed.

Manufacturer refurbished generator does not come with the adapter. I bought an aftermarket one from Amazon.

I don't keep it plugged all the time, maybe charging it for an hour or two before the 'dry-run' during the normal maintenance just to make sure everything starts and runs.

However there are times (did that a week ago) that I just ran with pull start without charging.

I live at a place where temp rarely goes below zero, so maybe that's the case for you. If so you may as well remove the battery and store it inside to prolong the life.

If the charger that comes with the generator still can't get the solenoid to click, then it really doesn't matter how many hoops you jump through to maintain the battery - you can't resurrect something dead, and just get a new battery.
For me, the trickle charger that came with the new unit does not have enough juice with a dead battery to get the solenoid to click. You need to charge the battery first with the trickle charger for a few hours, and then once the solenoid clicks, you can start the generator.

For people who run it every few months, there arent much hoops to get this to work. Its people like me who have this to use in an emergency or extended power failure, which may occur once a year or 2 and dont want to start it up every 2-3 months nor trickle charge it all the time that I did the external battery mod. My experience with SLA batteries is that they last about 3-4 years before needing to be replaced. Since I use SLA batteries in my UPS and always have a spare, keeping a fresh one for emergencies to hook up is very easy,
Last edited by whodiini December 8, 2025 at 11:39 AM.
2
Dec 08, 2025 06:54 PM
170 Posts
Joined Dec 2011
Buckshot5Dec 08, 2025 06:54 PM
170 Posts
Quote from Troublestylist :
For those of you with this unit, any advice on the best power level to run at? I'm going to use it to recharge my power stations, so I can choose to run it at quiet mode, quick mode, or most efficient mode. Ideally the most efficient is also quiet, which I'm guessing would be around 1500w on propane?
You got it. Most efficient at ~20-50% (640-1600w) load in eco mode.
Dec 08, 2025 08:40 PM
664 Posts
Joined Jul 2013
coronalForceDec 08, 2025 08:40 PM
664 Posts
so basically if we're only using this thing for emergencies its better to go for the $250 DieHard pull start one ?
Dec 08, 2025 10:52 PM
43 Posts
Joined Jan 2015
roadtarDec 08, 2025 10:52 PM
43 Posts
Quote from Stunner2xx :
Is there a reason why people here are on propane instead of gas?
You dont have worry about the carb gumming up with the gas sitting in the tank..When using propane...I have 30 year old harley that i change the fuel every 3 month when not riding and the tank look like new inside.Ethanol is product they put in fuel that kill rubber parts in carb.

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Dec 09, 2025 12:05 AM
162 Posts
Joined Oct 2015
palzDec 09, 2025 12:05 AM
162 Posts
Quote from scott_tiger :
Any idea how long will a 20 LB Propane tank last if I only use a refrigerator and freezer. Trying to figure out if I need to buy more tanks.
A 20 lb propane tank on a 3200-watt generator typically lasts 5 to 10 hours, depending on the load. Expect around 5-8 hours at 50% load (1600W) and much longer at lower loads (like 100-300W for a fridge/freezer), potentially reaching 12+ hours.
Dec 09, 2025 03:46 AM
1,677 Posts
Joined Jan 2006
whodiiniDec 09, 2025 03:46 AM
1,677 Posts
Here is an FYI and a YMMV. If you live in northern california, are under PG&E and qualify, you can get a $299 rebate on this, making this essentially free, just pay tax.

You must check on the PG&E website:
https://www.pge.com/en/outages-an...ogram.html

Start the application and enter your PG&E account number and your address. It will tell you if you qualify. before some know it all rude responder says it is only if you live in a fire area, that is not true. Just follow this. You need to buy it before Dec 31 to qualify, and there are other requirements as well on the web site. I suggest you read it and not flood SD with questions for people to read it for you. The firman WHO2942 and WH03242 are on the qualified list. It also must be purchased new and not refurb and purchased within 12 months of submission date. That is the quick summary of key requirements.

The only confusing aspect is that Costco online ad shows a picture with a different part number WH03200 and the description says WH02942. It is important what the receipt says since the WH02942 is eligible but the WH03200 is not eligible.
Last edited by whodiini December 8, 2025 at 08:51 PM.
2
Dec 09, 2025 04:08 AM
992 Posts
Joined Sep 2005
wakkoDec 09, 2025 04:08 AM
992 Posts
Quote from new_berlin :
is this literally for use during a black swan type event meant to sit in the garage ideally never to be used?

also would a small solar station be better to get as a first setup ?
Small solar isn't going to do anything except charge phones. For $300 you're not getting any equivalent 3k solar station power. Also you would need to buy solar panels too if you don't have any.
Dec 09, 2025 04:23 AM
10 Posts
Joined Dec 2025
SociableRoad139Dec 09, 2025 04:23 AM
10 Posts
Is this a good deal?
Dec 09, 2025 04:26 AM
1,677 Posts
Joined Jan 2006
whodiiniDec 09, 2025 04:26 AM
1,677 Posts
Quote from SociableRoad139 :
Is this a good deal?
dead is dead, so question is moot
Dec 09, 2025 05:07 AM
16 Posts
Joined Jun 2018
JonM7600Dec 09, 2025 05:07 AM
16 Posts
OOS in SoCal
Dec 09, 2025 05:30 AM
592 Posts
Joined Sep 2018
ProtegeDec 09, 2025 05:30 AM
592 Posts
Quote from SociableRoad139 :
Is this a good deal?
With all the negative reviews I would be really concerned taking this on a trip far from home.

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Dec 09, 2025 07:30 AM
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Joined Dec 2016
Sleek777Dec 09, 2025 07:30 AM
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