| http://www.w3.org/ns/prov#value | - It recirculates on cold start for boiler protection, then checks to redirect flow out to tank when up to temperature.this simple diagram shows a Thermobloc unit by Caleffi which integrates check valve, circulator, 3-way bypass valve and temp gauges in one convenient package.There are other brands that do similar thing, like Termovar sold by Tarm (BioHeat USA).... or if cost is an issue, I may just
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