J Scott in order to learn more about the topic so I can be more efficient at analyzing potential deals.

In order for each phone call to be more efficient, you must be open to showing them how you evaluate.

Best way to scale, lower per-unit cost, start to realize efficiencies of scale.Unless you have a very high rate currently, it's worth considering a HELOC.

This involves the most efficient use of your time and money (see #1).3 - Money. 

In theory, you can get two high-efficiency combi boilers, which would handle both heating and HW.

Can you please suggest one which is most efficient and causes less damage?

I'm currently looking to do a flip soon, but I haven't had the opportunity to work with any reliable, quality and cost efficient crews.

Few questions getting started: Do any you out there have tips on what helped you ramp your learning and experience at a more efficient rate? 

The pros of a newer building are less maintenance, More Energy Efficiency, better chance for separate utilities, no worry about lead, and typically higher rents. cons it's going to be a lot more expensive.

It works in REI, but it is the simple way with limited life span of opportunity filled with too much competition to make it the most efficient use of your them and money.I've never worried about the sale price, since whatever the seller and I agree to, isn't what it will actually cost ME anyway.