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Master Plumber:
I have an old 3 story, 2 family brick that has an oil, hot water system (no separate water heater). One zone. The radiators at end of loop (rear of house with extension) don’t get hot. Tenant on first floor is always home but I am at work all day. Would like to set up separate zone for tenant and remainder of house. Questions: (a) Can existing plumbing be supplemented to create 2 zones? (b) Will it solve end of loop heating problem? (c) Should I add water heater? (d) Will it reduce heating costs?