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norbert26
Premium
join:2010-08-10
Warwick, RI
reply to Subaru

Re: hydronic heat issue

said by Subaru:

Speaking of bleeding, If my heater was cold then that means the rest downstream from my radiator would be cold too as well right?

I am assuming hydronic heat = circulating forced hot water heat. In this case there are TWO ways this type is / was done. One used older cast iron rads. This kind of system had a valve at each rad. In this case one rad could be airbound but the loop can bypass that air bound rad and the next will get heat fine. Again this type of system has a valve at each rad. Modern upgrades may even include an electronic valve at each rad . That said there is type 2 . These are the more modern base board type rads. These run along the floor on the baseboards and do not normally have a valve present in each room. In this case if one room is airbound then anything downstream will not get heat. This type of system may also have zone valves in splits on the loop. For example a ranch house may be split into two zones where one zone serves the front and one serves the rear or a two story house each on its own zone. In this case if one zone becomes airbound all downstream on that zone will not get heat.


Jack_in_VA
Premium
join:2007-11-26
North, VA
kudos:1
Reviews:
·Millenicom

Baseboard hot water heating radiators do not get air bound as the circulating pump forces hot water through each one in the loop and then back to the boiler to be reheated. They are a series loop and what goes into the first one has to come out the last one.



norbert26
Premium
join:2010-08-10
Warwick, RI

said by Jack_in_VA:

Baseboard hot water heating radiators do not get air bound as the circulating pump forces hot water through each one in the loop and then back to the boiler to be reheated. They are a series loop and what goes into the first one has to come out the last one.

if its just one big loop yes. However usually there is a split in the loop or zones for example after leaving the boiler there is a tee where one side will go to the back of the house the other will serve the front. In rare cases one side could become airbound or worse a pipe could freeze. However in most cases one side of the house would simply get more heat then the other. One side rarely becomes completely airbound but not 100% impossible as i have seen many different installations. This is why there are air bleed valves on both sides of a loop some installations even had an airbleed in every room. Again i can not stress enough each install is different and i don't know how the OPs rental is plumbed.


Jack_in_VA
Premium
join:2007-11-26
North, VA
kudos:1
Reviews:
·Millenicom

If the system is zoned the zone control valves usually are located right at the boiler on a header on the hot water outlet of the boiler.

When a zone thermostat calls for heat the corresponding zone valve opens, the circulating pump starts and supplies hot water to that zone.