I upvoted both of @Russell Brazil's comments, as a WI licensed broker myself, even though I've used my license mostly for my own investing, you apparently have great faith in your agent/broker's abilities (here in WI we have two levels, agents and brokers, brokers require a bit more training BUT that's not to say there aren't many agents out there who know the biz inside and out and may know more than many brokers even do and some licensees just don't know much at all-so then its a question of whether or not they go to their managing broker for advice or just go rogue and shoot from the hip-which is NOT a smart strategy!)
I'm assuming there must be some relevant details missing and these are short posts of course, so that's understandable but sure leaves me wondering what your agent is thinking by even suggesting that would be a worthwhile offer to submit, both for what Russell pointed out, you could get sued for damages if the seller is led to believe anything more than what you said, that "hey I might/should have this HELOC $$ but it may just fall apart too" and if that's all the offer says, I can't see many sane sellers (and their agents) doing anything but trashing that offer ASAP.
The only chance maybe is if its been on the mkt for 2 years, NO ONE wants to touch it and they'd probably listen to someone who's listing their Powerball tickets as their proof of funds! "Here, see $345 MILLION RIGHT HERE!! Or $180M if I take the lump sum, but these are damn good #s I've been playing for years, this is the week!!"
You said its a hot deal though, so why in the world would they even bother looking twice at anything but solid offers?
Off the top of my head, the best offers rundown might go like this:
#1 in line being CASH (with SOLID proof of funds, i.e. letter from bank exec saying "yes he's good for it!" being the best since they can call to verify, as it is not hard to bogus up a Photoshopped "$2 mil in my checking account" statement when its actually $2.00, or if real balance, you COULD withdraw that cash tomorrow, but when a bank exec vouches for cash buyer, that's GOLDEN!) NO contingencies and FAST close (usually takes at least a week around here to get title work done even for rush jobs, but title co's like to be sure about things!) so that's a dream offer assuming price is good, then it goes down from there.
Mortgage involved? Now closing just went from maybe 2 weeks or less to prob 6 to 8 weeks, but holding out for a cash sale w/quickie close is usually unrealistic. NICE when it happens though!
Home inspection? Oh great, we get to spin the "home inspector roulette wheel" some inspectors are GREAT, some others, well not so much and can jeopardize a sale for reasons that are dubious at best!
If you can know enough about inspecting a property yourself, removing the inspection contingency can be a big plus and why REO sales usually say "NO INSPECTION CONTINGENCIES"!
Besides that stuff on making one offer look 10x better than another that may even be offering more $$, I agree with Russell's concerns about the agent willing to write these offers that would say basically "I SHOULD be able to pay, but don't totally count on it, might easily blow up on us!" because we've got to follow some pretty tight guidelines for submitting offers and besides his very valid legal and liability concerns, also the reputation factor. Even in a big metro area there are only that many agents out there and they nearly all work for a limited # of firms, I can't see that offer making any agent look too professional, either.
Just looking at the terms often set for REO sales, assuming they aren't DESPERATE, tells a lot about what makes up a great looking offer to a smart seller and smart listing agent/broker!