Correct

水暖

/ shuǐ nuǎn / 
Strokes

Example

As a Noun

hot water central heating system

1
Shuǐnuǎn
水暖
xìtǒng
系统

water-heating system

As a Noun

water supply and heating

2
Shuǐnuǎn
水暖
shèbèi
设备

water supply and heating installations