I'm having a conversion done from oil to gas in my home. HVAC guy is putting in a Weil Mclain ultra 155...I've seen the work the HVAC guys does and as a novice I can say it was VERY neat and impressive,,,It was at the house of the electrician that will be wiring up the boiler. That job had standard gas unit (not a mod con) with multiple zones radiant heat ect. and indirect DHW..The electrician was showing me the Tekmar unit that controls his whole unit saying that him and the HVAC guy never did a Weil Mclain MON CON yet but that I would have the Control unit. They both have over 25 yrs in the business.
My question is the Weil Mclain spec's show the the control board is built -in and handles all controls,, and that when adding zones you just have to use a relay to each zone pump,,I'll have 3 heating zones and 1 indirect for DHW..Will a Tekmar be necessary??