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Hydronic System with In-slab, Radiators & Water Heating
Someone recently showed me a really simple hydronic design which I have sketched up and attached. I haven't shown the expansion vessels, check valves etc, but have shown enough detail (hopefully) to describe the principle. The system has water heating, radiators and in-slab heating. The in-slab circuits each have their own thermostats and electrically operated valves. The radiators each have a thermostatic valve. The main circulator is fitted into the Caleffi Anti Condensation Valve (Type 281066). The flow rate in the main loop is about 5.5gpm. The flowrate through the water heating and in-slab circuit is about 2gpm. The flow restrictor/meter is there to restrict the flow to 2gpm and monitor it from time to time. It might also be possible to replace the circulator with an Alpah 2.
The design seems so simple that I think there must be a catch but maybe I'm wrong. I was wondering anyone had any thoughts on this.