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i am testing that theory now .. gona run down and check it .. i turned off the intake valve and the preasure seemed steady .... left it for 30 mins and... its at 22 psi.

did that, it fully drained out .. well i thought it did. .. i may try it again and leave it open longer -- but i did use the air valve to let air into it.

i didnt get all the water out at first ,, but i keept going later on and did have no water trickling with both the valves wide open (after a bunch of darker coloured water came through in the last...

i bled the tank dry and set it all back in motion .. it all worked great till i took a shower and it was back to 30 psi and water coming out of the relief valve again.

should i drain it again ?

i had posted in another forum .. but im told this is the correct place.

oil hot water boiler .. i thought it was a furnace but i guess i know not of what i speak :)

relief valve released...

wrong terminology then .. its a oil furnace that heats my water which also supplies my house with heat through water heated baseboards.

and i just found the right drain valve for the expansion...

I was done in the basement this morning then the relief valve on the oil furnance sort of popped and about 4 litres of water poured out. PSI at 30 and temp between 180 and 190. Just started...