Infinitas Design

Renewable Energy System Design & Development


CIBSE Heat Networks Consultant

Posted on 15 May 2018


Infinitas Design Ltd has recently attended the CIBSE CP1 training course and is now registered as a Heat Networks Consultant. Our details can be found on the Heat Networks Consultants Register. We are one of only 90 consultants in the UK certified on the scheme

Infinitas Design Derby CIBSE Cert Heat Networks Consultant

Heat Networks registration number HNC202688

Whilst many engineers are competent heat network designers, the code of practice and associated certification is intended to raise the standards for heat supply in the UK. The code of practice is not a set of rules or design guidelines. Rather it includes lots of lessons learned from experienced heat network designers and sets down minimum and best practice standards for any heat network at any point in its development. If the amount of heat delivered by heat networks in the UK is to increase from its current level of 2% to 20%, it is essential that design, installation, operation and customer experience is of the highest standard. 

The code of practice defines a process map for the development of a heat network covering the following project stages:

  • Preparation and Briefing (Client)
  • Feasibility
  • Design
  • Construction and Installation
  • Commissioning
  • Operation and Maintenance
  • Customer Expectation and Obligations

Some of the main learnings highlighted in the code of practice focus on the correct sizing of heat plant and the network itself, minimising network heat losses, achieving and maintaining low return temperatures, use of variable control principles and optimising the use of low carbon heat sources within the network. There is also a very strong focus on health and safety as well as contracts and legislation.

Many of the best practice and minimum standards will be very different to thinking in the recent past such as:

Traditional thinking


The use of 82°C/71°C flow and return temperatures from gas boilers

Large pipe diameters

The use of very thin insulation to minimise capital costs or indeed, no insulation on building pipework

High operational costs as heat losses cost money

Not oversizing heat plant

System inefficiency and high capital cost

Not using low loss headers or 3 port valves

Uncontrollable return temperatures


Most interestingly, the use of gas CHP, which has been most popular in large heat network developments, particularly in London, is falling down the ratings in terms of carbon emissions. The most favourable technology for carbon emissions is large heat pumps using water, ground or waste heat sources. The code of practice for water source heat pumps, CP2, covers this in more detail but that’s the subject of another article.

From our point of view, low temperature heat networks powered by ground or water source heat pumps with large thermal storage and electrical storage are the best way to go when looking at new and retrofit heating schemes.

We are now one of only 90 certified heat network consultants in the UK. If you are looking for a heat network designer or consultant certified to CP1, look no further. We’d be pleased to get involved with your project. Call 01332 854639