My boat came with a Wallas and I have also installed a Wabatso and the combination is excellent for heating and some cooking. Especially if you attract bad weather like I do off Vancouver Island and other places. I also use a cheap $20 Korean butane stove and a Jet Boil. I like the Wallas in the morning, it has slow heat, I warm the cabin and I heat my coffee, make a thermos of hot water for later in the day and sometimes if we don't need an early start, we put the dutch oven on it and make biscuits or muffins. We do most of our cooking on the butane stove and often in the cockpit on top of the cooler. The steam from the cooking stays outside and doesn't soak the cabin, the fish and bacon smell stays outside. If I want a fast cup of coffee the jet boil is the fastest stove for this. The Wabatso which we just installed last year is a far superior heater with the forced air and is amazingly fuel efficient. For me the Wallas did not supply enough heat to dry out the cabin, but the Wabatso does. This is the combo that I use, because the boat came with the Wallas and I have had zero problems with it.
If I was in your shoes and buying a new boat, I would not spend $4,800 on a Wallas. i would take a quarter of the money and install a Wabatso or Espar (I'm German, so no Chinese heater for me). Then I would go down to your local Asian Super Market and spend $20 on a butane stove and a $20 more on a bunch of butane canisters (cheaper at the Asian SuperMarket than at the camping store) Take the rest of the money and spend it on cruising, fuel, moorage, dinners out etc. If you decide to do something more permanent in the future you still have that option and no holes in your counter top.