noun
light, heating and water (utilities)
Refers collectively to the three basic household utilities: electricity (light), gas/heating, and water. Often used in contexts like utility bills or living costs.
光熱水費は毎月の大きな出費です。
Utility bills (for light, heating, and water) are a big monthly expense.
このアパートは家賃に光熱水費が含まれています。
In this apartment, utility costs are included in the rent.
水道代 is specifically the water bill, whereas 光熱水 covers all three utilities together.
Compound of 光 (light, i.e., electricity), 熱 (heat, i.e., gas/heating), and 水 (water).