Humayd bin Hilal narrates: "Abu Rifa'ah (may Allah be pleased with him) used to heat water for his companions, then say: Perform your ablution well with this, and I will perform my ablution well with this (other water). Then he himself would perform ablution with cold water."
Hadith Referenceالمعجم الكبير للطبراني / باب التاء / 1269