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Help on chosing a Indirect hot wanter tank for Lochinvar WHN110
I am converting from oil to gas heating this winter. Three contractors quoted me the same boiler Lochinvar WHN110, however, each give me different indirect water tank model: (1) Squire SIT040 (2) Squire SIT050 (3) Super Stor Ultra SSU-45. Which indirect water tank should I chose?
Squire indirect water tank is made by Lochinvar, will they work better with the Lochinvar boiler? According to Lochinvar website Tank Sensor Included for use with KNIGHT Heating Boiler. However, They are $200-$400 more than SSU-45 depending on the size (SIT040 $200 more, SIT050 $400 more based on the online price search I did). Does it worth the extra money to go with the Squire indirect water tank or the SSU-45 is just fine since it also limited life time warranty?
Also, my house is 2600sqft (including 600 sqft basement) with 4 people live in. What size should I chose for the water tank? 40gallon(SIT040), 45 gallon(SSU-45) or 50 gallon(SIT050)?
One last question, should I consider upgrading to WHN155 in case I need to do addition to the house in the future? If I go with WHN155 w/o doing addition in the future, will this cause lower efficiency for the system and cause short cycle as I read in the discussion here.
Thank you for your help.