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'dhw' ??? balance? how do i do that? wat is dhw ? :(

hi all, i have a small problem. i live in a 4 bed detached hoise. but since we moved in, never have all the rads worked together. they all work, but not together. if i turn off the water feeding the copper cylinder, i'll get 2 more rads to work, and so on, someone told me the...