In-line water heaters.

[Triple]

Anyone use them?

I'm about to start a major plumbing overall in my cabin and I'm considering ditching the old tank-style water heater in favor of one or more in-line heaters.

They are supposed to be more efficient since they only heat the water as needed (instead of keeping a giant tank of water hot all the time), but I'm wondering how they'll handle the accumulating sediment of well water.