Enjoy limitless hot water exactly when you need it with the UKEW Instaheat 13.5kW Tankless Instant Water Heater, a powerful and efficient solution engineered for multi-point residential and commercial applications. Whether you need to supply hot water to a kitchen sink, bathroom basin, or even a shower, this high-performance unit delivers a continuous flow without the bulk or energy waste of a traditional storage tank. With its robust 13.5kW heating capacity, it rapidly heats water as it flows through the compact unit, ensuring a constant supply at your desired temperature for one or two outlets simultaneously. Its sleek, wall-mountable design saves valuable floor space, making it perfect for flats, offices, small businesses, holiday lets, and extensions where space is at a premium.

Designed for both performance and absolute safety, the Instaheat 13.5kW features advanced digital controls with a clear LED display, allowing you to monitor and adjust the water temperature with precision. Comprehensive safety systems, including leakage protection, overheating protection, and a built-in pressure relief valve, provide complete peace of mind during every use. Engineered for point-of-use installation, this unit connects directly to your cold water supply, heating water only when needed—completely eliminating standby heat loss and helping to reduce energy bills. The convenient automatic memory function retains your preferred temperature settings, ensuring consistent comfort every time you turn on the tap without needing to readjust.

Key Features

• Powerful 13.5kW Instant Heating: Delivers a continuous, high-volume flow of hot water on demand—no waiting for a tank to reheat, ideal for busy households or light commercial settings.

• Multi-Point Capability: Suitable for supplying one or two outlets simultaneously, such as a kitchen sink and nearby basin, or a single shower with excellent flow.

• Space-Saving Tankless Design: Ultra-compact unit (396 x 220 x 88mm) mounts neatly on the wall, freeing up floor space and eliminating unsightly storage cylinders.

• Digital LED Display & Controls: Clear digital interface for easy monitoring and precise 1°C temperature adjustment to suit your personal preference.

• Comprehensive Safety Protection: Built-in leakage protection, overheat protection, thermal cut-out (95°C), and a pressure relief valve ensure safe, worry-free operation.

• Automatic Memory Function: Intelligently remembers your last temperature setting, so you don't need to reprogram each time you use the heater.

• Easy Point-of-Use Installation: Connects directly to 1/2" copper pipework and requires a 60A circuit breaker with 10mm² cable (installation by a qualified electrician essential).

• Efficient & Cost-Effective: Heats water only when needed, eliminating standby heat loss from storage tanks and potentially reducing energy consumption and utility bills.

Technical Specifications

Frequently Asked Questions (FAQs)

1. What is the advantage of the 13.5kW model over the 11kW version?
The 13.5kW model provides higher heating power, which means it can deliver a greater flow rate of hot water at a given temperature rise, or achieve a higher temperature at the same flow rate. This makes it particularly suitable for colder incoming water temperatures (like in winter) or for applications where a more powerful shower experience is desired. It offers more headroom for performance compared to the 11kW unit.

2. What are the specific electrical requirements for installing this 13.5kW heater?
Due to its 13.5kW power rating, this unit requires a dedicated high-capacity electrical circuit. You will need a 60 Amp double-pole isolating switch, a 60A circuit breaker (MCB) in your consumer unit, and must use 10mm² cable (twin and earth or suitable flex) for the connection. This installation is complex and must be carried out by a qualified electrician to ensure full compliance with IET wiring regulations (BS 7671) and safety standards.

3. Can this heater supply hot water to a shower and a sink at the same time?
Yes, this 13.5kW model is designed for multi-point use and can supply one or two outlets. For example, it could comfortably supply a shower, or a kitchen sink and a basin simultaneously. However, using two outlets at once will split the flow, so you may notice a slight reduction in flow rate at each outlet compared to using just one. It is not designed for whole-house supply to multiple bathrooms simultaneously.

4. How do I adjust the temperature, and will it stay consistent?
You can easily adjust the temperature using the digital controls and LED display, typically in 1°C increments. The heater features an automatic memory function that saves your preferred setting. However, please note that the outgoing water temperature is influenced by the incoming mains water temperature and the flow rate. If the incoming water is colder (e.g., in winter), you may need to reduce the tap flow slightly to maintain the same output temperature.

5. What safety features protect against scalding or overheating?
The Instaheat 13.5kW is equipped with multiple safeguards. It has an overheating protection feature that cuts power if internal temperatures exceed safe limits (60°C), plus a thermal cut-out at 95°C as a ultimate backup. The built-in pressure relief valve manages excess water pressure. While it includes anti-scald measures through temperature control, we always recommend checking the water temperature before use, especially when children are present.