i have to be fair and say that my negative comment applies only on piping module, elite load calculation is based on CLTD and RTS and does very detailed calculation. duct module is also precise, it only misses european standard duct sizes default set.
actually i have not seen american piping software i would like. elite piping seems to tend to form "academic" piping network, where every pipe will be calculated in detail, but there are no possibility to link it to real-life system, establishing different rules for main network, risers, branches and connecting pipes. neither there is practical way (that i was able to find) to conduct balancing and make balancing report.
i use british cymap that gives me opportunity to establish rules to about everything - sizing criteria for different kind of systems according to trade rules, distinction between different position of pipes as mentioned above, temperature regime, balancing reports, possibility to calculate piping heat losses, complete intelligent link between piping and heating/cooling emitters, that actually put the whole system into calculation.