I just picked up a 12v dc pump from solar pumps with stainless connections for 75 bucks. I think the GMP is about half the one you linked to but for 5-10gal batches it's plenty.
That being said though, the solar pumps pumps have soft starts. I'm not sure how well that would jive with PWM.
Couldn't you turn a ball valve into a servo pretty easily? Even use some of the electronics from a small plastic model servo but replace the motor with a gear motor with a lot of torque. All you need to do is attach a pot to the shaft of the valve.
I've been avoiding pressure related level sensing. All of them require an open tube in wort which screams sanitary issues to me. Considering soldering a chain of reed switches together to make something like a multilevel float switch.
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If I was wife and kids free I would take it in a heartbeat even with a major drop in salary. I would have been working at a brewery long ago but the overhead of family life is way too high to support with a brewery job. Owning would be my only option.
I've had it in mind to develop something similar to this thing but more brewer-centric. I hate how this thing takes the brewer out of brewing. I also hate how it is a plastic wonderland. If you're gonna put something out that is supposed to make great beer it should have little to no plastic...
The thought behind pitching yeast quickly is to allow them to crowd out any foreign bacteria as soon as possible. Yeast reproduces really fast. The earlier you get it in there, the sooner nothing bad can even begin to contend with its meal.
We can all go to work and do our jobs half as well...
Is that 1800w cook top enough to bring say 7gal to a rolling boil? I'm super curious about them.
Add: Also curious. When you turn the thing on, is there another step to turn the element on? I'm wondering if the power to the whole unit could be turned on and off for automation purposes like...
Man I apologize, I'm a dick. What you're providing is great and the price isn't bad. I think you're tapping a starving market of home brewers who want better temp control but aren't into wiring 220v and programming. I'm a programmer by day and I've worked a lot with microcontrollers for brewing...
I don't want to be a negative nancy and take away from this guy's business but that's only 4-500 bucks of goodies. Granted, the software is written and it's prebuilt...mostly...but still.