mcconnellplumbing , educating people on a product they have never used is the best thing to do . kudos to you for doing so , it sure saves a lot of headaches in the future when you hand them a piece of paper in advance that has all the pro and cons.
Seems eventough most people have internet , few consumers take the time to do some homework before hand.
I plumbed my house so I have 2 shutoffs at the lowest point in the system . When I go away for extended periods in the winter , I shut my well pump off drain the pump which has it's own drain valve , open the 2 shutoffs and drain all the pipes in the house.
I also empty the (whole house) water filter and walk away knowing that nothing will freeze.
It takes me 5 minutes to do all of the above.
When I return , I close the 2 the shutoffs and the valve on the pump , prime the pump by topping it up with some water, and I'm back in business in 5 minutes.
10 years and all is fine in Canadian sub-zero weather.
I used 3/4 inch flexible metal tubes with their own fittings and seals on the ends to hook up my tankless water heater , which makes lifes easier on the initial install and if I want to remove it later.
Cheers............................................................Vin.