Areas include:

Domestic and commercial plumbing systems including hot and cold water, heating, drainage, rainwater.
Heating includes underfloor, radiator systems, boiler systems gas, oil and solid fuel. Heat pump systems, wet solar.
Warm air systems.
Kitchens, bathrooms, showers.
Hot water unvented, vented, solar assisted, boosted.
Escapes of water, housing fitness for habitation disrepair, system failures.
System design, troubleshooting, forensic, surveys.
Thermal imaging.
Water Regulations, building regulations, british and european standards.
Patent disputes.