A hydronic system is to supply four panel radiators, each with their own thermostatic radiator valve, and an indirect water heater from a gas-fired sectional cast-iron boiler. The system is designed using primary / secondary piping as shown below. The primary circulator operates whenever the space heating load or the indirect water heater call for heat. All circulators are standard, fixed speed, wet rotor units.
a. Can you spot at least 6 details that are incorrect?