That might make sense, but as it doesn't mention any cooling features, I assumed it was purely for (faucet) hot water. The fact that there's no tank is weird if

That might make sense, but as it doesn't mention any cooling features, I assumed it was purely for (faucet) hot water. The fact that there's no tank is weird if it was for residential hot water, I think you're right that it's for heating. (or combo, with a separate hot water reserve for showers)