diff --git a/domain/epc/property_overlays/main_heating_system_overlay.py b/domain/epc/property_overlays/main_heating_system_overlay.py
index 89b62ea46..6069b7a49 100644
--- a/domain/epc/property_overlays/main_heating_system_overlay.py
+++ b/domain/epc/property_overlays/main_heating_system_overlay.py
@@ -174,6 +174,8 @@ _MAIN_HEATING_CODES: dict[str, int] = {
     # from the code (cert_to_inputs). A generic "Community heating" with no named
     # source stays unmapped (-> None) — the source can't be assumed (ADR-0041).
     "Community heating, boilers": 301,
+    # Community CHP + boilers — SAP Table 4a 302 (heat network, category 6).
+    "Community heating, CHP and boilers": 302,
     # Modern standalone oil room heater — SAP Table 4a 623 ("Oil room heater,
     # 2000 or later", no boiler). Natural fuel heating oil (ADR-0041).
     "Oil room heater, 2000 or later": 623,
diff --git a/domain/epc/property_overrides/main_heating_system_type.py b/domain/epc/property_overrides/main_heating_system_type.py
index eb4658b84..d79fec1d1 100644
--- a/domain/epc/property_overrides/main_heating_system_type.py
+++ b/domain/epc/property_overrides/main_heating_system_type.py
@@ -28,6 +28,7 @@ class MainHeatingSystemType(Enum):
     SOLID_FUEL_ROOM_HEATER_CLOSED = "Solid fuel room heater, closed"
     AIR_SOURCE_HEAT_PUMP = "Air source heat pump"
     COMMUNITY_BOILERS = "Community heating, boilers"
+    COMMUNITY_CHP_AND_BOILERS = "Community heating, CHP and boilers"
     OIL_ROOM_HEATER_POST_2000 = "Oil room heater, 2000 or later"
     GAS_FIRE_CONDENSING = "Gas room heater, condensing fire"
     GAS_FIRE_DECORATIVE = "Gas room heater, decorative fuel-effect"