How Level 3 system choices — fully pumped, zoned, interlocked — shape an efficient modern wet central heating layout.
Choosing the system type
At Level 3 you justify a system from the dwelling, the fuel and the client brief, not from habit. In a fully pumped layout with a hot-water cylinder, the circulator drives both the heating circuit and the cylinder primary, replacing older gravity primaries. This gives faster response and proper control.
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