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That unit looks like this one Faster Hot Water For Tank Type and Tankless Water heaters. The Chili-Pepper is about half the cost. I wonder which one is more heavy duty. Sure would be less work.
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I've had the 1/4" sensing line on the pressure switch freeze on mine. It won't know your system pressure has dropped until that ice plug melts.

I'm looking for a good fix for a hot water problem in a 30 year old 20' x 40' condo that is on a slab. The hot water heater is on one end of the unit and the copper pipe runs 40' under the slab to...