Wakasa begins living in Tatsumi's bathtub. Just having a merman live in his home is difficult enough, but another major problem arises: the living expenses including water for Wakasa!
Apparently using this will 
reduce your gas bill.
يبدو أن استخدام هذا النظام سيخفّض من قيمة فاتورة الغاز‏.‏
Hiermit kann man den Gasverbrauch senken.
Con esto podremos ahorrar 
en la factura del gas.
Con esto podremos ahorrar 
en la factura del gas.
Si on prend ça,
Parece que usar isto faz 
diminuir a conta de gás.