diff --git a/etl/epc_clean/epc_attributes/HotWaterAttributes.py b/etl/epc_clean/epc_attributes/HotWaterAttributes.py
index b94ab092..b292daff 100644
--- a/etl/epc_clean/epc_attributes/HotWaterAttributes.py
+++ b/etl/epc_clean/epc_attributes/HotWaterAttributes.py
@@ -120,6 +120,8 @@ class HotWaterAttributes(Definitions):
         "ogçör brif system, adfer gwres d+¦r gwastraff": "from main system, waste water heat recovery",
         "twymwr tanddwr, tarriff safonol, adfer gwres d+¦r gwastraff": "electric immersion, standard tariff, waste "
                                                                        "water heat recovery",
+        "ogçör brif system, dim thermostat ar y silindr, adfer gwres nwyon ffliw": "from main system, no cylinder "
+                                                                                   "thermostat, flue gas heat recovery",
     }
 
     def __init__(self, description: str):