No hot river from tank-less dampen electric fire within grease burner. It comes out hot than cools enormously quick.? ...

Inside my micro oven within is a small...
Answers:    sounds like the tank-less coil requirements to be acid flushed to remove built up deposits
Why my Tagaki tankless dampen electric fire can...
Not ample information.

Oil pressure?
Water demand flow rate?
Brand/model of kiln?
Adequate venting?
Adequate combustion nouns?
Has it been working fine and have suddenly gone wrong, or is it a new install that have been problematic from daytime one?