I would replace the window; no air or water leaks will provide efficiency in the home.

Perfect.WELL, One cold Sunday night (why wouldn’t it be LOL) I went down into my basement and found both (2) of my oil tanks slowly leaking from the bottom from rotting from the inside out over the decades.

Well, the isolation valve broke off instantly and sprung a leak leading me to shutting off the water to the whole house.

Things like a light fixture that has been removed and not replaced or properly capped off...actual missing flooring...any plumbing leak that would keep the system from holding pressure...a malfunctioning thermostat on the oven...etc.The reason I bring these things up is that if the required repairs - that is the repairs FHA requires to be done before they will underwrite a loan - are greater than $5000, then the property WILL NOT qualify for FHA financing.  

What if the roof starts leaking?

I prefer working class, employed types, if they show up at a ob all day, they are less likely to want to dick with me.I'll make sure the roof doesn't leak, the mechanicals work and the place meets code, but bare white walls,thick urethane floor varnish, and that's about it.

I was interested in the water sensors that shut off water in the event of a major leak.

You'll sleep better at night because roof leaks can get expensive fast from drywall damage and mould.

They're at your mercy to take care of it.You say the boiler broke twice and then failed catastrophically (leaking.) 

If your time is best spent elsewhere, we put a ton of man-hours into building, and using/testing (as well as the use of our clients) a model that's accurate, efficient, and report-ready.I'm about to tackle a slow leak in my shower, so believe me, I understand the self-help spirit, but if I can't fix it in an hour, I'll probably call the plumber (probably).