The CWH-4200DC is a tankless electric shower water heater (instant water heater) from CORNELL — with integrated DC pump, so it works even if water pressure is low.
Power rating: 4.2 kW — typical for instant water heaters.
Safety & protection features:
Double-thermal anti-scalding system — power auto-cuts off at 55 °C to prevent scalding; also overheat protection (cuts off at 85 °C).
Built-in RCD / Residual-Current Device — provides safety against electrical faults.
Splash-proof housing (IP25 rating) — suitable for wet bathroom/shower environment.
Water / flow requirements:
Minimum required water flow: 2.0 L/min
Works at relatively low water pressure — so the DC-pump helps maintain consistent water flow even if building water pressure is weak.
Build & durability: Has a “nylon glass-fibre” tank + robust heating element — designed for regular household shower use.
Installation & water connection: Uses standard ½" threaded BSP water inlet/outlet (common in Malaysian plumbing setups).
Size and weight: Roughly 230 × 395 × 95 mm; weight ~ 2.2 kg — compact enough for typical bathroom installations.
Suitable for low-pressure water supply — because it has a built-in DC booster pump, it can generate enough flow for showering even in apartments or homes with weak municipal water pressure. This is often a big advantage in high-rise flats or areas with inconsistent water pressure.
Instant heating — no water tank needed: Heats water on demand, so you don’t need a large storage tank. Good for showers, quick water heating for washing, and generally saving space.
Safety-conscious design: Anti-scald cutoff, overheat protection, built-in residual current safety device — all help reduce risk, which is important for water heaters used in bathrooms.
Compact and versatile installation: Because of its size and standard water inlet/outlet, it can be installed in many bathrooms without major renovations — good for retrofits or upgrades.
Reliability & durability: With protective housing (splash-proof), quality heating element and pump design, it’s built to stand up to regular shower use rather than occasional use.
Malaysia
