HI folks. Looking for some answers before experts arrive, informed advice welcome!
Below 20 degrees, my heating system cannot keep up with Tstats. Single digits and I'm dealing with 55 degree zones caused by lukewarm baseboards and very warm cast iron radiators.
What is the cause, where do i start looking?
Three year old gas boiler. Fires right up, LED status lights on main board all correct.
Temp dial to 200 (max) and efficiency (min).
Z1 = two story 1850s house, six cast iron radiators
Z2 = one story 900 sq foot kitchen/family room, baseboard + kick
Z3 = water heater set to 160 deg and NO priority
Tstats both set to 70. Might was well be set to 100, doesn't make any difference.
Tstats ARE calling for heat at the boiler.
Boiler running for 5 and shutting down for 5. ish. Boiler temp gauge seems to be fluct between 160 and 190, I don't recall i need to go back down there and look,
Plenty of (160) deg hot water.
Tacos on two zones, both are spinning as they should. Zone 2 Taco is 2 years old.
I have bled all radiators and kick heater (let at least half quart of water out of each). Cast iron radiators are same temp top and bottom. No air / spit came out of any of the bleeds.
I cannot find where to bleed baseboards? I bled kick which is either last or first in line, in any event, on the same level/floor as all the baseboards.
Baseboards are LUKEWARM, at best.
Cast iron radiators are very WARM but far from scalding hot - on floors one and two.
Downstairs, at the boiler:
SUPPLY pipe at boiler/beyond to all zones - warm
RETURN pipe at boiler - scalding hot !
Insulation on much of, but not all of the pipes under the house.
In short, heat is fine when above 25 degrees or so but below that I'm in the situation above.
Where should I be looking next?
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