( It ( ( has ( ( a ( heating elements ) ) ( that ( boils ( ( the water ) ( in ( ( the reservoir ) ( when ( ( the humidistat ) ( calls ( for humidity ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ has) (NP (NP (DT a) (NN heating) (NNS elements)) (SBAR (WHNP (WDT that)) (S (VP (VBZ boils) (NP (NP (DT the) (NN water)) (PP (IN in) (NP (NP (DT the) (NN reservoir)) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN humidistat)) (VP (VBZ calls) (PP (IN for) (NP (NN humidity)))))))))))))) (. .)))
It has a heating elements that boils the water in the reservoir when the humidistat calls for humidity.
(ROOT (S (NP (DT A) (NN reservoir)) (VP (VBZ is) (NP (NP (NN part)) (PP (IN of) (NP (NP (DT a) (NN cycle)) (SBAR (WHNP (WDT that)) (S (VP (VBZ holds) (NP (NP (DT an) (NN element) (CC or) (NN water)) (PP (IN for) (NP (NP (DT a) (JJ long) (NN period)) (PP (IN of) (NP (NN time))))))))))))) (. .)))