CENWAT Water Heater Regulations

Question 1

Which Building Regulation part covers the installation of hot water storage systems in England?

Accepted Answer

Part G (Sanitation, hot water safety and water efficiency)

Answer

Part L (Conservation of fuel and power)

Answer

Part P (Electrical safety)

Answer

Part F (Ventilation)

Question 2

At what maximum temperature must stored hot water in a domestic system be maintained to prevent Legionella growth?

Accepted Answer

Stored at 60°C or above throughout

Answer

Stored below 20°C

Answer

Stored at exactly 45°C

Answer

Stored at 50°C or above only at the cylinder stat

Question 3

What is the function of a thermostatic mixing valve (TMV) at the point of use?

Accepted Answer

To blend hot and cold water to a safe outlet temperature (typically 48°C for baths, 43°C for showers) preventing scalding

Answer

To increase mains water pressure

Answer

To control the flow rate through the tap

Answer

To prevent backflow from the hot water system

Question 4

What is the recommended maximum outlet temperature for hot water at a bath tap to prevent scalding risk?

Accepted Answer

48°C

Answer

70°C

Answer

55°C

Answer

60°C

Question 5

What regulation governs the installation and use of gas water heaters in the UK?

Accepted Answer

Gas Safety (Installation and Use) Regulations 1998

Answer

Water Supply (Water Fittings) Regulations 1999

Answer

Building Regulations Part L

Answer

COSHH Regulations 2002

Question 6

What is an instantaneous water heater?

Accepted Answer

A device that heats water on demand as it flows through, with no storage

Answer

A water heater with a large insulated cylinder

Answer

A heat pump water heater

Answer

A solar thermal water heater with a storage cylinder