As long as they both run simultaneously, I don’t see the need for check valves. The only was to do this is disable the pressure sensor on the pumps and run them both off one external sensor on the pressure side. That’s how I run 4 together. I currently use a Wasco adjustable sensor, but for the first couple years of tinkering with my setup I just used a air compressor switch. The water never seemed to effect it. I had a on-70psi, off-110 psi switch.
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I don’t want to spam this thread with my newbie questions but you are much more knowledgeable in this topic than i am. Could you pm me if you have the chance? It would be much appreciated.
Reviving this, any fresh experience with the 24v pump? Any real world stats using 3/8" hose? I’m really needing about 10-15’ extra height.
If this isn’t a typo then I can tell you that just upsizing your hose to 1/2" or, better yet, 5/8" will help you tremendously.
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Maybe it is 1/2", they just gave me a roll of blue Ag hose. I’ll have to check when I get home.
I have 30 2 story patio home units to do in the spring and really need something to hit the gutters with. They probably haven’t been done in 20 years.
By that time I hear there will be a new fangled downstream injector on the market… 
Hey if it’ll put 3% on the gutters I’m game.
I wouldn’t use 3/8” on 24v……
You should be able to reach two story with 12v using 1/2” hose no problem.
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It does, somewhat. I’d like to reach the chimney on a two story though…without using a ladder.
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I’ve never had to pull out the chem hose for nasty gutters… and we’ve had them bad as they get. Have you tried throttling the machine down about halfway?? That will cause you to pull a much hotter mix to knock out those gutters no problem. I also do this to pre and post treat concrete. I’m using a 3-5 gpm injector on my 8 gal machine
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I really don’t have the time or energy to throttle the machine down, never fails most houses are on a hill and three stories. I may try it just to see if it works though.
Much easier than pulling out the chem hose… and you still have a better reach than with your 12v. If you need to get some smaller tips than what you use for 8gpm to make your spray reach further when the machine is throttled down
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I have a job tomorrow, will try it on a siding wash with my weak SH.
Weak sh 
I throw in dirty brick chimneys as a bonus & set limited expectations. Then I downstream them with 2 or 3 applications & rinse everything except the chimney. I had a filthy one this past year. It was still filthy when I left but a few weeks later I drove by & it looked fabulous. Dwell time doesn’t get near enough credit around here.
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PREACH
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I tested 7gpm @60psi vs 7gpm @100psi 12V pumps. Huge difference WITH THE RIGHT SETUP. If your hose, gun and nozzle are right, you’ll get a huge bump. For example, with a 2nd story soap nozzle, 5/8" hose, and a PVC ball valve setup, 60psi got me 31 ft of horizontal distance. 100psi got to 55 ft. Maybe you don’t need the larger hose, never tested. I think the best approach is to optimize everything that you can and see if you even need the larger pump. It’s not only GPM, but PSI that matters.
I have the 24v pump and it puts out more volume than a 12v. Maybe mine is not plumbed correctly, but I only get 5 to 10ft more. Im actually im the process of adding a gas softwash system again because the 24v is not doing it for me.
