Y
HN Search
Hacker News Search
new
|
comments
|
top
|
jobs
sparselogic
searching PlanetScale…
1.
▲
2.
▲
3.
▲
4.
▲
5.
▲
6.
▲
6 ms
·
31.
▲
by
sparselogic
7y ago
Drain line heat exchangers are built for this. They preheat the water heater supply line using waste heat from drain water. Renewability Power-Pipe [1] was the first one I encountered, but there are several in the NA market. [1] http: