Ko te thermostat he momo taputapu whakahaere pāmahana aunoa, kei roto i te nuinga o te wā he wāhanga pūoko pāmahana, mā te whakawhānui, te whakaiti rānei hei tahuri me te whakaweto i te rere o te wai whakamatao, arā, ka whakarite aunoa i te wai ki roto i te radiator kia rite ki te pāmahana o te wai whakamatao, ka huri i te whānuitanga tohanga o te wai whakamatao, hei whakarite i te kaha whakamarara wera o te pūnaha whakamatao.
Ko te thermostat matua o te mīhini he thermostat momo-ware pi, e whakahaerehia ana e te paraffin i roto i te kaupapa o te whakawhānui wera me te whakaheke makariri hei whakahaere i te tohanga o te whakamatao. Ina iti iho te pāmahana whakamatao i te uara kua tohua, ka totoka te paraffin kua whakatikatikaina i roto i te tinana ine pāmahana thermostat, ka kati te takirere thermostat i raro i te mahi a te puna i te awa i waenga i te mīhini me te radiator, ka hoki te whakamatao mā te papu wai ki te mīhini, ka huri te huringa iti o te mīhini. Ina tae te pāmahana o te whakamatao ki te uara kua tohua, ka tīmata te paraffin ki te rewa ka huri haere hei wai, ka piki te rōrahi ka pēhi i te ngongo rapa kia whakaitihia. I taua wā anō, ka whakaitihia te ngongo rapa ka pana ki runga i te tokotoko pana. Ka pana te tokotoko pana ki raro i te takirere kia tuwhera te takirere. I tēnei wā, ka rere te whakamatao mā te radiator me te takirere thermostat, kātahi ka rere hoki ki te mīhini mā te papu wai mō te tohanga nui. Ko te nuinga o te thermostat kei roto i te paipa putanga wai o te pane rango, he painga o te hanganga ngawari me te ngawari ki te tuku i ngā mirumiru i roto i te pūnaha whakamatao; Ko te ngoikoretanga, he maha ngā wā ka tuwhera, ka kati hoki te thermostat i te wā e mahi ana, ka puta ai te āhuatanga wiri.
Ina iti te pāmahana whakahaere o te mīhini (i raro i te 70°C), ka kati aunoa te thermostat i te ara e anga atu ana ki te radiator, ka whakatuwhera i te ara e anga atu ana ki te papu wai. Ko te wai whakamatao e rere ana i waho o te uhi wai ka tomo tika ki te papu wai mā te ngongo, ka tukuna ki te uhi wai e te papu wai hei tohanga. Nā te mea kāore te wai whakamatao e mimiti haere i te radiator, ka taea te whakanui tere i te pāmahana mahi o te mīhini. Ina teitei te pāmahana mahi o te mīhini (i runga ake i te 80°C), ka kati aunoa te thermostat i te ara e anga atu ana ki te papu wai, ka whakatuwhera i te ara e anga atu ana ki te radiator. Ka whakamataohia te wai whakamatao e rere ana i waho o te uhi wai e te radiator, kātahi ka tukuna ki te uhi wai e te papu wai, ka whakapai ake i te kaha whakamatao me te ārai i te wera nui o te mīhini. Ka kiia tēnei ara huringa ko te huringa nui. Ina kei waenganui i te 70 °C me te 80°C te pāmahana whakahaere o te mīhini, ka noho ngā huringa nui me ngā huringa iti i te wā kotahi, arā, he wāhanga o te wai whakamatao mō te huringa nui, me tetahi atu wāhanga o te wai whakamatao mō te huringa iti.
Ko te mahi a te pūwhakamahana wai o te waka he kati i te waka i mua i te ekenga o te pāmahana ki te pāmahana noa. I tēnei wā, ka whakahokia te wai whakamatao o te miihini ki te miihini e te papu wai, ā, ka whakahaerehia te rere iti i roto i te miihini kia tere ai te mahana o te miihini. Ina neke atu te pāmahana i te pāmahana noa, ka taea te whakatuwhera, kia puta ai te wai whakamatao mā roto i te porowhita whakamahana katoa o te tāke kia nui ai te rere, kia tere ai te marara o te wera.
