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Freaking neat work, clean and tidy. Are there air chambers on the shower valve? On KS stubs I sweat two tee's on, pointing up and down on the finish...up to faucet feeds, down to DW & Ice maker. Here vents can't go any more than 45 degree's below flood, except with permission from the local inspector for bow vents. What diameter is that recirc line?
At first, I didn't realize it was a kitchen, which explains the confusion regarding four water lines. Nice idea to spread them to avoid hoses. But I associated pics of a water heater with 'utility room' and thought it might be for a utility sink of some kind.
It's been quite a few years since I plumbed a house in copper. I was using manifold plastic systems for a long time, so each fixture gets its own pipe. The dishwasher would be piped directly under the dishwasher rather than through the cabinets, for example. Icemaker line gets its own line and box, any addition by the homeowner later would be a cinch since I always left extra outlets. And avoiding walls not only protects from freezing (on outside walls), but makes for easy replacement/repair.
We don't have to strap water heaters here, either. Maybe one day we'll have an earthquake and that will change.
I wouldn't use a union on a PRV because it makes it easier for the HO to mess with it. And remember, this isn't a money area - when we bid a house here, we don't add anything extra. In fact, from what I've seen lately, we don't even pay attention to code. Some horrible stuff going in these days. Maybe I should take up housing again just to show 'em how it's done.
I'm probably going back to a 3-year-old duplex today where the plumber piped the PRV right into the washing machine trap . . .