I te wa e kowhiri ana i te whakamahana wai ahumahi, he mea nui ki te whakarite kia rite te kaha whakamahana o te whakamahana ki te awhe whakamahana e hiahiatia ana o nga taputapu tukatuka. I tua atu, me whai whakaaro ano hoki te mana o te pāmahana o te chiller, me te hiahia mo te waahanga whakauru. Me whai whakaaro ano koe ki te pehanga papu wai o te chiller.