You can test the condition of the "current" coolant with a voltmeter. Put it on low range (0-2v is all you need), one probe in the coolant at the top of the radiator (don't touch the probe to anything else but coolant) and the other probe on ground somewhere, block works, battery works I use battery because it's right there. If you see more than about 0.6-0.7v, you will want to flush. I highly doubt you'll see more than 0.4v. If it's low, just drain & refill with 50/50 green (ethylene glycol) coolant. Don't use ELC (extended life coolant)--aka the yellow, gold, or red stuff and don't use any of that crap that GM cars & trucks use/used either--it's garbage. Just use the green stuff.
With that few hours on the meter, and lack of age, I can't see any justification in a complete flush...UNLESS the current stuff is "worn out" which is unlikely. As said, it's testable with a digital volt meter.
What's the volt meter tell you? As the coolant "wears out", it becomes more acidic. Well, the cooling system kinda sorta acts like a lead-acid battery. The more acidic the coolant is, the better and more electric current it "makes", which is why it's testable with a DVOM. When it gets real acidic, it will tend to make the cast iron block/head oxidize, and you'll start to see crud build up and reddish/brown coolant. THAT'S when it needs a flush (for sure!)-but is highly unlikely again due to the lack of use and lack of age. You can also test with PH but most of us have a DVOM handy anyway.