3.1 The Heat Line 'S24/S30 Compact' is a fan flued, wall-mounted combination boiler that supplies both central heating and mains fed domestic hot water. Being There are a wide range of gas boilers available in the UK and they are split into three main categories. A gas combination boiler also known as a gas combi Installation, Servicing. & User Instructions. Wall Mounted. System Boiler. Page 2. compact s20s s24s s30s. 01. Page 3. compact s20s s24s s30s. 02. Page 4 Leading national plumbers' merchant supplying plumbing and heating products, boiler spares. Click here to access our troubleshooting guide. Your Question: Compact S24 & S30. The Heatline Compact S24 and S30 are a range of standard efficiencyHeatline Boiler Manuals 41-157-01, Download, Heatline S20S Compact System, NG/LPG 47-157-02, Download, Heatline S24 Compact Combi, NG/LPG.