I know from replacement that hot water heaters build up scale.

My question is would plumbing in from a hot water supply decrease scale in the boiler of an HX machine?

-Cecil

Possibly?

One factor you should consider is that a huge advantage of heat exchanger machines is they flash-heat cool, fresh water on demand. This gives you the best-tasting water (as opposed to old, heated water from the boiler). If you plumb into the hot water line, you'll defeat this advantage.

Moreover, I don't think that espresso machine pumps are designed for a hot water supply. You may shorten the life of your pump.

Finally, a heat exchanger works by running cold water through an extremely hot environment to predictably heat it to a desired temperature on the other side. We flush to tune this to the right temperature. If you use a hot water feed into the heat exchanger, you will find it takes much longer to flush down to the desired brew temperature.

I would strongly recommend against hot water supply for these reasons.

Never use hot tap water for food or drink.

Ok I will take that as a resounding NO.

That said, I know the type of buildup I see on new faucets and other water outlets here. So I guess delivery water will be the bet. Procon states that they can pump 4-5 ft of draw, and this has been beaten to death I am sure. So the pump/filter/pressure accumulator is the best bet?

-Cecil