Dear Customer,
With this pump it can be installed using 15mm pipework providing it is within 2m of the hot water cylinder, the pump does come with 22mm hoses so you would have to set up from 15mm to 22mm when connecting to the hoses.
However it would be much better if you could supply the pump all the way in 22mm and then reduce to 15mm on the outlet side.
Kind regards
Answered by: Julie - Salamander
Date published: 2019-05-17