Part 7 - Central heating (CH) and Domestic Hot Water (DHW) circuit
H Model System layout 1: H model boiler using internal pump for central heating and optional
connection with an indirect tank for DHW. Only use this option if heat system heat loss is less then
50,000 BTU and consists of one zone of heating. If not, please use system layout 2. External expansion
maybe required, see , location in piping shown in System layout 2 and page 42: expansion tank
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