No, not anything of 2 7gpm pumps, but I do something similar. My setup is a bit unique to say the least, I run a series of cheap low gpm booster pumps tied together. I use them to boost tap pressure to about 100 psi and downstream off that to wash houses. I went with cheap disposable pumps because normal 5.5 or 7 gpm pumps need to draw from a tank and not have high inlet pressure. The cheap pumps take that just fine for about 70-80 house washes, then I have to throw them away and replace. I buy them in bulk at about $10 each, so not a big deal. Here is a link to my thread explaining my setup. I’ve made a few more tweaks since then, like covers over the pumps and a better pressure switch.
I don’t know why you couldn’t put a couple 7gpm pumps together and run them off one pressure switch similar to what I have.
