An old New England farm house has been heated with a two-pipe steam system serving plenty of sturdy cast-iron radiators. As part of an extensive renovation and insulation upgrade, the owner decides to upgrade the heat and convert the system to a high-efficiency, gas-fired condensing boiler.
The owner is also complaining about the inability to adjust heat in different rooms. The piping system installed by the local plumber is shown below. It leaves as much of the two-pipe distribution in place as possible.
What are some design details that you think are incorrect or missing?