On Jul 19, 10:39*am, Clive wrote:
In message
,
Andy Dingley writes Whilst the Giffard injector stops working with
hot water, heat isn't a big problem for pumps.

Indeed, the colder the water the better the feed and ease of operation.
--
Clive

The feedwater temperature is between a rock and a hard place. Cooler
is better for the pumps.
But hotter is better for boiler efficiency and dearation of the makeup
water.
The boiler feedwater tank needs to be as high as possible to minimise
possible pump cavitation.