What it is & Key Specifications
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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.
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Power rating: 4.2 kW — typical for instant water heaters.
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Safety & protection features:
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Double-thermal anti-scalding system — power auto-cuts off at 55 °C to prevent scalding; also overheat protection (cuts off at 85 °C).
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Built-in RCD / Residual-Current Device — provides safety against electrical faults.
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Splash-proof housing (IP25 rating) — suitable for wet bathroom/shower environment.
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Water / flow requirements:
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Minimum required water flow: 2.0 L/min
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Works at relatively low water pressure — so the DC-pump helps maintain consistent water flow even if building water pressure is weak.
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Build & durability: Has a “nylon glass-fibre” tank + robust heating element — designed for regular household shower use.
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Installation & water connection: Uses standard ½" threaded BSP water inlet/outlet (common in Malaysian plumbing setups).
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Size and weight: Roughly 230 × 395 × 95 mm; weight ~ 2.2 kg — compact enough for typical bathroom installations.
What It’s Good For — Strengths & Use Cases
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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.
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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.
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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.
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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.
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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.
