I'll willing to install them myself, if I can find a RTA/Knock Down dealer the will sell it assembled.

They do get a little pricey depending on which unit you were to install, and the bad part is that they do not last 6-10 years without ever needing service. i have yet to come across an on demand boiler unit that hasnt needed service within 2 years and the parts take a while to come in.good luck

I have installed a few.

@Tammy WiseTry 220 grit sand paper (the metal screen kind) with a good cleaner. 

I install vinyl plank because water does not harm it. 

If you are owner-financing this, then it will be considered an installment sale on your taxes.

My homes had metal boxes with BX cable.

I'd like to hear some guesses or first-hand accounts of how much it costs to install HVAC and ductwork in a house that currently only has radiator heat.  

We're thinking of going with decent carpet tiles for a number of reasons: no hidden costs, no installation costs, if they get destroyed we don't have to replace the whole carpet, and they're a 'green' product (which is a big deal in our market). 

In the case that they needed materials ahead of time (like fixtures, outlets, etc), I ended up purchasing the materials myself and asking the subcontractors to install them.