DHW pipework

Situation

 EPG
In housing, it can be specified whether the tap water system is applied to the bathroom and/or the kitchen. This means that 1 or 2 domestic hot water systems are defined within the house. A system needs to be specified for both the bathroom and the kitchen in housing. Example: a combi-boiler which delivers hot water to both the bathroom and the kitchen, or one boiler delivering hot water to the bathroom and an electric water heater delivering hot water to the kitchen.

Calculation method

 EPG
The method to determine the emission efficiency for domestic hot water systems in a residential building is indicated here. Method b is a simple method which uses fixed emission efficiencies, whereas method A is more elaborate as the emission efficiency is determined based on the centre line of tap water pipes and the length of the pipelines to the bathroom and kitchen.

•      Simple (method B), simple method with fixed efficiencies. It is only required to specify the internal diameter of the pipelines to the kitchen.

•      Detailed (method A), extended method. In addition to the internal diameter of the tap water pipes to the kitchen, also the length of the tap water pipes to the kitchen and the bathroom are required.

Internal diameter

 EPG
The internal diameter of the tap water pipes to the kitchen can be specified here. This diameter is used to determine the emission efficiency for both the simple and the detailed method.

•      <= 8 mm, the internal diameter of the tap water pipes is not greater than 8 mm on at least 2/3 of the length of the pipes;

•      > 8 mm and <= 10 mm, the internal diameter of the tap water pipes is greater than 8 mm and not greater than 10 mm on at least 2/3 of the length of the pipes;

•      > 10 mm, the internal diameter of the tap water pipes is greater than 10 mm on at least 2/3 of the length of the pipes.

Length of pipework to bathroom

[m] EPG
The length of tap water piping to the bathroom is specified here in m. This is only required if the detailed calculation method is applied.

Length of pipework to kitchen

[M] EPG
The length of tap water piping to the kitchen is specified here in m. This is only required if the detailed calculation method is applied.

All taps are located within a radius of 3 metres from the generating unit, output, or circulation system

 EPG
For utility buildings it should be indicated whether the average length of the tap water pipes is more or less than 3 m. The length of the pipes is measured from the generation unit, circulation system, or delivery set to the tap.