diff --git a/src/app/db/schema/landlord_overrides.ts b/src/app/db/schema/landlord_overrides.ts
index 3a0bfe72..13005b18 100644
--- a/src/app/db/schema/landlord_overrides.ts
+++ b/src/app/db/schema/landlord_overrides.ts
@@ -245,6 +245,7 @@ export const MainHeatingSystemValues: [string, ...string[]] = [
   "Gas room heater, flush live-effect",
   "Gas room heater, open flue 1980 or later",
   "Gas room heater, open flue pre-1980",
+  "Electric storage heaters, high heat retention",
   "Unknown",
 ];