I paid $800.00 for labor to replace a steam boiler battery (a battery
is the "block"). Do do it, they had to remove all the systems such as
fuel lines, ignition, refill system, etc., cut the (copper) piping, and
reattach it with sleeves. It took two guys around half a day.
My quote to replace everything was $3,500 which included an entire new
system and labor. Turns out the battery was in its 9th year on a 10
$8000 sounds really high to me.