Tankless water heaters have a series of coil or pipes to absorb heat quickly from the flame. The faster the water flows the less time it has to absorb heat. I disagree with the person at Girard, the tankless heater depends more on flow rate than it does on pressure. I've used many tankless heaters in 3rd world countries, if you turn the water up its cold, turn it down its hot, pressure stays the same, only the flow rate changes. Pretty simple. Turning up the pressure allows more force to push the water thru the restrictions which increased the flow rate. Your MH should be able to take 60 psi with no problems, most are tested at 80-100 psi.
Hope this all makes sense and I haven't confused you more, if so please say so. I don't mind questions, I ask them all the time! Lol
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