I have a 20 year old Voyager model SSVH90 that provides DHW and heat for a radiant floor system in a 2000 sq.ft. home. I'm planning to replace it before it fails. My system was originally designed by HCS in Berkeley, CA. The unit has done what it was designed to do very well though I suspect it might be slightly oversized. I recently had a local company send a technician to replace a failed DHW mixing valve and his suggestion was to go with a wall hung Lochinvar boiler with a Squire indirect tank. He gave an off the cuff estimate of $24,000 for the job. I checked the Lochinvar boilers and they seem to be among the best. I did a rough estimate of parts involved for the replacement and even with labor at $140/hr., the price seemed high. I'm in the process of securing bids but would like to get some opinions, not only on the price, but on the equipment itself. Should the output of the condensing boiler replacement be the same as what I have with the Voyager- 90,000 BTU? The Voyager tank is 45 gallons. Do I need one that big for the indirect heater? The Lochinvar manual shows two different plumbing schematics--one with a LLH and one without. Would one or the other be preferable for my situation? Thank you.