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Need Advice on Basic Gas Condenser Boiler Set-Up for Radiant Heating & DHW
Based on current advice, I am choosing between a combi condensing boiler TT Prestige Excellence or a TT Prestige ACV MAX 110 with Lochinvar 67 gal indirect water heater. The set up needs to provide hot water for a radiant heating system of 1250 sf in a concrete slab and another 1250 sf under a wood floor of Pex with fins. DHW is for three showers, washer, sinks, kitchen etc. The climate in oceanside San Francisco is very mild with winter temperatures in the 40s and 50s. The house is sealed tight with stucco and double pane windows. I am looking at two zones, up and down, with separate thermostats. The main question is whether a premium combi will do the job or add an indirect water heater that pushes the cost up by several thousand. Any additional advice greatly appreciated. - Tom