Hot water baseboard heating (new old thread)

For everyone who is sick of scrolling through 525 posts.

Hot water baseboard heating

we just converted from oil with a Burnham burner, 14 years old, to gas with a high efficiency Alpine burner, and we have baseboard heat. The oil heat was quick, heating the house 5 to 10 degrees in about 15 minutes. the gas heat with the Alpine is so slow, heating the house about 1 degree every 20 to 30 minutes. is this normal? the company who installed it said it is, and that if we want it to be more efficient, we cannot turn the heat down. this sounds crazy, and we do not want the heat so high while we sleep, and prefer to turn it down, but it is so slow to heat the house, and so it is cold in the morning for hours. can someone elaborate or help with this?