Lot20 is a European standard introduced in January 2018 for the manufacture of storage heaters. It specifies that manufacturers must include the following features within their storage heating products:

The introduction of this standard is completely separate to whether a device is a high-heat retention storage heater.

As per RdSAP Convention 4.09: "A storage heater can be classified as high heat retention only if the brand name and model is location in the database [PCDB]."

Unless a Lot20 compatible device is specifically listed as a HHRSH, it should be input to iQ-Energy as the following: