Company entity per privacy notice (https://www.coway.sg/privacy-notice, verified 2026-08-06): "COWAY SINGAPORE PTE. LTD." Origin: brand-story page (https://www.coway.sg/brand-story) describes the company's founding in Korea in 1989 and its "Yugu factory" in Korea as its original manufacturing site; does not use the literal phrase "South Korea" but the Korean origin is unambiguous from context. Service model: Heart Service page (https://www.coway.sg/heart-service) states "a Coway technician will visit the customer's home to assist with filter changes" — read as in-house field service. coway.sg's product-list and product pages (e.g. /products-list/water-purifier, /products/<code>) are client-rendered and did not expose model names, purchase prices, or rental terms to automated fetching in this research pass — the site appears to require a registered account / sales consultation to see pricing, consistent with Coway's direct-sales/rental model. Model-level pricing in this dataset was sourced from Coway's official storefront on Shopee ("Coway Singapore Official Store"), found via the BigGo Singapore price-comparison aggregator (https://biggo.sg/s/coway+water) rather than coway.sg directly — flagged per-model in each model's notes. Physical dimensions and detailed specs found for Coway models during research were mostly sourced from Coway Malaysia's site (coway.com.my) — these were NOT used in this dataset since they are not an SG-official or SG-retailer source; those fields are left null instead.