pro1 no prime at all
>> this makes sense with what I see
pro2 prime button you pump
>> I cannot see any kind of pumping button on these. Is it a little paddle on the double connector where the hoses come in to the top? I think I could see a little paddle there. This double connector is the dual tap?
pro3e auto prime
>> This model clearly has a thumb button you can pump, but why would you need it if it has an electric primer?
the prime is not that much of a big deal as once the filter is started and the hoses are full of water the filter will start fairly easy without sucking hoses
>>> I believe you on this, even though I'm asking about it I don't really consider it a big deal.
to tell the truth i like the double tap more on the pro1 rather than the pro2
>>> This is good info, helps me get on with weighing between my 2 or 3 choices (2222 or 2224 or 2026 now)
but i would just forget the pro1 now and buy the pro2
>>> This is the hardest part for me. I'm realizing I need to ask my dealer a little more pointedly whether its just the pro1-thermo models or the entire pro1 line that has been or is being discontinued (in USA distribution). If they are all being discontinued then it might be harder to get parts later if I choose the 2222 or 2224.
T1K (& Bastables), I think your points are well taken that the larger pro2-2026 would be a better guard against obsolescence since its a newer design/model-line and that it would be an advantage if we moved up to a bigger tank in the future. As soon as I get (if I get) harder info about the "discontinuation" issue, I would have two definite points in favor of the pro2. In favor of the pro1 is less current blowing the fish around and a good price (at this point I can't rule out that the good price may be because of discontinuation!)
as for themo filters i have never had one as i feel its better to have a stand alone heater because if the heater packs up you dont lose the heater and filter
>>> This has been in the back of my mind all along and I have finally dumped the idea of the thermofilter. The extra complexity of having a separate heater will be worth the flexibility of dealing with each device separately if it breaks. In the computer world we have found this same thing to be true in printers - the all-in-one devices that combine printers,faxes and scanners are a huge hassle if one function breaks. Since there is some issue about salt messing up the temp sensor used in the freshwater versions of the eheim thermos, I think this issue is settled and I'll get a hydor 150 or 200w to hook inline with a plain filter.