We currently have a 30 yr old propane boiler with 4 zones. One zone is for indirect DHW for which we have a storage tank. This system has worked well for us. We got bids from 2 local outfits - one our propane dealer who also sells, installs, services boilers, the other is our HVAC / plumber. Reputation-wise, we are comfortable with either. Propane dealer recommends going tankless for DHW, and installing a Rinnai combi boiler. HVAC guy recommends keeping our indirect DHW storage tank and installing a NTI FTV combi boiler, using one zone for DHW as we have now. Our water quality is excellent except for being somewhat acidic. We have a water quality system installed to bring the pH back to neutral. Major differences between the quotes - the Rinnai has slightly better warranty (12 yrs, not 10) on heat exchanger, one recommends installing new high-efficiency circulating pumps and one doesn't. Would appreciate some expert thoughts and opinions. Thanks in advance. Kate
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