Well guys, I REALLY appreciate the time and effort for the help. But as I got always a active brain that has "a idea" but somehow going though the "gearbox" after thinking it more.."Does not compute" Original thought was to try the $100 4800 watt to see what would it would do heat. If halfass good, upgrade to 10,000 watt or more. Wood BS the heat is getting old and cost and time? I pay 9 cents KWH, so little if any increase and care less anyway. What did I say about "spend $3 to save a buck"? Well, I'm never to old to learn.
Plan now is shitcan the old idea, and do it right. "Never enough time to do it right the first time, but plenty time to do it right second time" Not gonna waste time and nickle/dime/mickey mouse something.
Gonna go large here, buy a permanent hard wired 50 amp required AND HAVE A ELECTRICIAN DO THE hook up. PROPER! Makes ya sleep better at night.
Thanks again all, as we all learn something every damn day. Its the cool rainy season PNW, and simple bored. Soon? Shop door open, bikes out, as one my 3 boats and forget all about it..(until next winter!) Pic my shop, and a 15 foot I rigged up, crank up rebuild Merc (some say overpowered? BS! To MUCH aint enough

) But some my toys first.
Leave ya with this. When I hear "electricity isn't rocket science"? BS! Do it wrong and .."rocket ya on yer *** FAST" "stick a fork in here and...(tasers are kids stuff compared 220/50)! Pix some my junk. Thanks again all
The boat build next..thats the frame up Dragbike I built 25 years ago, still sitting here but pickled.