The solenoid is there because sometimes, the captain
and crew get a little relaxed, a little tired, have a few too many margueritas, or that second bottle of such nice wine...and fall alseep before they remember to shut the tank. Or so I've heard.
You cook, it goes CLICK, and if it is pouring out you can continue to stay below and eat dinner, warm and dry, and it still backs you up if you forget the tank. Or prefer to stay dry and warm.
How much propane...I guess that depends on how much explosion you consider recreational, versus an interruption in your breakfast? I've been on a number of boats that regularly use the Korean single
butane burners as the galley
stove. $20 including the carry case, a buck or two per can and one of those will do a 3-day weekend...It does't worry me but we do keep the cans isolated and sealed. Still, when there's a proper gas stove in the galley
I'd rather see the solenoid and sniffer (and those little bastards are devils, real devils, they taunt you about nothing when there's no even any gas on the boat sometimes!) because I'v seen burn wards and debridement and I really really really never want to do anything that might get me into that situation.
If you're hardwiring gas lines, please. Add a solenoid and sniffer, and if you're really not interested in that, VISIT A BURN WARD. Don't expect to sleep that night. Burn victims are often put into medical
comas, because even morphine cannot blunt the pain.