-ы, ж.
Женск. к истопник.
истопни́ца
Женск. к сущ.: истопник.
растоплятельница, растопница, растапливательница, растопщица
истопни́ца,
истопни́цы,
истопни́ц,
истопни́це,
истопни́цам,
истопни́цу,
истопни́цей,
истопни́цею,
истопни́цами,
истопни́цах
"Everything that is beautiful and noble is the product of reason and calculation." Charles Baudelaire
"The best way to keep your friends is not to give them away." Wilson Mizner
"Silence is the mother of truth." Benjamin Disraeli
"Never forget the three powerful resources you always have available to you: love, prayer, and forgiveness." H. Jackson Brown, Jr.