I should also mention that are getting rid of the garbage disposal in the prep sink, so we won’t have the air switch.

All a prep sink needs is WATER. Use a decorative soap pump . Other features are for a large main sink. Or plan this to look like clutter, as will your island.

Neither of these were 15", but it may help give you a visual. I am not a fan of soap bottles sitting on stone or estone countertops; they damage tops from trapped water.

If you have the space, I'd suggest an 18" prep sink, which will also give you a few more inches for one of the accessories. My 'prep' sink does double duty, so I understand the need for a water dispenser.

Yes, it will look too crowded. And I think you should keep a disposal there. It’s a “prep” sink, so if you will be prepping, you will need to dispose of the scraps of prepping.

Just about the hot/cold water dispenser: in the array of things to have at a prep sink, that would be the one I’d opt out of. I will link a thread below, though it’s about only hot water dispensers, not hot/cold. Some people on the thread loved theirs, others did not; you can read the pros/cons and decide for yourself.

As I wrote in that other thread, don’t forget to pay attention to the water filter for this faucet. My mom’s was a Franke, and not only was the water filter expensive, it was quite difficult to replace regularly as needed—not like a fridge water filter that pretty much unscrews out and screws in. It was a Whole Thing to put a fresh filter in. I don’t know how the Insinkerators are in this regard, so I suggest you check that out.

https://www.gardenweb.com/discussions/5865974/is-a-hot-water-dispenser-next-to-your-faucet-worth-it#n=33

Had the hot water dispenser at my main sink and had it removed. It felt so wasteful and although we are tea drinkers so much easier to just use an electric kettle and fresh water.

Forgot to answer your question, yes it’s too much. All you need is a faucet and disposal. Dishes get done at the main sink, not draining at your island.

Thanks everyone!

We use our existing 15" prep sink for rinsing fruits and veggies, straining pasta and prepping raw meat. We rarely use the disposal and I find it can get smelly, which is not pleasant when we have guests over hanging out near the island.

We also have an existing Insinkerator instant hot dispenser, which has been in this house for 15 years and it's still going strong. We use it all day long, every single day. I'm a hot water drinker, so I'm constantly using the instant hot. I also use it for cooking if I need to speed up boiling water. It's definitely a stable in our household. The filter replacement isn't too bad, and it only costs around $30. Thanks for sending me a link to that other instant hot discussion @Shannon_WI! That was helpful.

The only thing we've never had before is a soap dispenser. I would be using it for hand soap. I would prefer my family/friends use the prep sink to wash their hands, rather than wash their hands over a sink of dirty dishes. My hesitation is the reliability of the built in soap dispenser, some hate it and some love it. Maybe I just have to find the right one that works well.

As for going with a larger sink to fill the 30" cabinet space, my concern is that we won't have any counter space to the left of the sink. The sink is going to be placed at the very end of the island. Right now a 15" sink allows for about 8" of counter space (as seen in my original post). Our fridge is right behind the prep sink, so we use that 8" of counter space a lot when we're grabbing dishes out of the fridge.

Maybe a prep sink with a ledge and integral cutting board can take the place of the lost counter space. I use it for chopping and prepping, adding ingredients to a bowl to keep the mess in the sink, and as a big spoon rest. This is the sink that I purchased but ours came with a poly board which is still available separately. I replaced the colander with a $10 expandable one that fits either ledge. It slides under the board so there's plenty of room to run the water.

https://www.highpointcollection.com/product-page/30-inch-workstation-undermount-stainless-steel-kitchen-sink

I have Westbrass and Rohl soap dispensers. Both fill from the top and no problems with either.

Giant estone island destroyed by a freestanding soap dispenser. I could fix it with a sink replacement with a faucet deck. Maybe.

@Joseph Corlett, LLC That's what my black granite looks like where we have a freestanding soap dispenser. Would i still have that problem with quartz, I wonder?

@wilson853 I was considering a workstation sink as well!

@CD I just wanted to chime in to say, contrary to almost all advice you'll get here, that I think you'll be fine without a disposal in your prep sink. (I'm sure you already know that if you're planning to get rid of it.)

DH felt very strongly that we not have a disposal in our prep sink partly because of the smell (he's got an overly sensitive nose), but mostly because he's a water quality specialist and hates the idea of sending more water and waste through our local treatment facility. Instead he got a deep strainer basket, and we put most waste into compost. (Now if only we could remember to toss the strainer in the DW regularly.) I thought I would miss the disposal, but I don't.