In the summer its fine but winter time you only get hot water for about two minutes

Steam or forced hot water boiler?

Single pony relay and circulator setup for the heat or zone valve(s) and circulator setup for heat?

How many zones (thermostats) in the home?

If multi. zone, is your heat run off of a multi. zone relay box (red/green lights on side of box)?

Is the hot water coil wired to run off its own aquastat?

How old is the system?

Please answer all questions as best you can.

Back to you...

Mark

Hot water 2 zone yes 20

2 zone and an aquastat or 1 zone (thermostat) and 1 aquastat?