[Mike Halliday]

If I pump pure pure water through a diesel heater that is scaled up from heating normal water in a hard water area would the scale massively contaminate  the water so it’s no longer pure?

 or would it not be in the burner long enough to dissolve the scale? I can see how if it’s at in the heater over night it has time to become contaminated but what about the few seconds it passes through when in use

[dazmond]

the only way is to test the tds of the water after passing through the heater i would have thought........

[robert mitchell]

If I pump pure pure water through a diesel heater that is scaled up from heating normal water in a hard water area would the scale massively contaminate  the water so it’s no longer pure?

 or would it not be in the burner long enough to dissolve the scale? I can see how if it’s at in the heater over night it has time to become contaminated but what about the few seconds it passes through when in use

It will be fine .