NT-Trinity		
Model 150		
Exchanger 83012		
Johnstone	$2700	2 wk
Boston Heating supply $2300 http://bostonheatingsupply.com/trinity83012heatexchangerkit.aspx
Parts4heating $3688 https://www.parts4heating.com/NTI-83012-Heat-Exchanger-ASME-Lx-Ti100-150-Not-p/83012.htm