Y brif safon ynghylch systemau chwistrellu ar gyfer eiddo preswyl yng Nghymru a Lloegr yw’r system â Safon Prydain 9251:2005. Mae angen i ddigon o bwysedd ddod o’r prif gyflenwad dŵr neu o danc dŵr ar gyfer cynnal y system hon. Yn fwy na thebyg byddai’n rhaid gosod tanc dŵr a phwmp ar wahân ar ei chyfer mewn cartrefi yng Nghymru. O’r herwydd mae’r dadansoddiad o’r gost a’r budd yn seiliedig ar gostau sy’n cynnwys gosod system o’r fath mewn eiddo preswyl newydd. Amcangyfrifir y byddai’n costio £3075 i’w gosod mewn eiddo preswyl a £879 i’w gosod mewn fflat (ceir rhagor o fanylion ynghylch y costau yn adroddiad y Sefydliad Ymchwil Adeiladu ynghylch y costau a’r manteision).
The main standard for sprinkler systems for residential premises in Wales and England is the British Standard 9251:2005.  This requires sufficient pressure to be delivered by the mains or to be tank fed. The likelihood is that installation would require a separate water tank and pump to operate in homes in Wales.. The cost benefit analysis has therefore been based on the costs of including such a system in new residential premises. The cost per residential premises is estimated at £3075 for a house and £879 for a flat (further details on costs are contained in the BRE cost benefit analysis).