I use this one zoro.com/aro-double-diaphragm-pump-air-operated-200f-pd03p-als-kaa/i/G2537026/#specifications
It is only rated for 200F, but I heat my syrup to 205-210, then draw it into my mixing tank, add DE and then mix and I then recirculate from the the mix thru the pump and back to the mix tank until it is fully blended. Then I open the valve to the filter bank and close the recirculate valve. I run it at up to 40 PSI on the filter pressure gauge. The pump can do far higher but my press suggests 40 PSI to keep from blowing papers.
I have not tested the temp as the blended syrup reaches the pump with pressure on it but I'll bet it is down to 200 by then.
That pump will move 5-7 gal/minute on recirculate thru about 15' of 5/8 ID hose. When filtering thru a 7" 5 bank it likely moves 3-4 gpm, I never checked it.
I have used that pump for 4 years. It does very well pumping hot syrup but for moving cold syrup it gets real slow, likely about 1 gpm, my solution for that was I got a heater (barrel band type) and I put the band on anywhere from 4-15 hrs ahead. 4 hrs is OK, longer heats it enough that the pump then moves about 5-6 GPM. The heater has a t-stat, I have that set at 150F and with the band near the bottom of the standing barrel it sets up convective circulating in the barrel and the whole barrel is heated. My band heater I think is this one bascousa.com/silicone-rubber-steel-drum-heater-3-inch-wide-30-gallon.html. My barrels are 26.5 gal and to get good contact I have to tie it with wire, the spring that normally holds it leaves it too loose on a 26.5 gal bbl.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.