SAP is the Government Standard Assessment Procedure for the energy rating of dwellings. SAP Appendix Q enables performance of new technologies including MVHR to be used in SAP calculations. Polypipe HR01 MVHR appliances are >92% efficient and easily satisfy the requirements of SAP Appendix Q and the Energy Savings Trust higher requirements of ≤1W/l/s and 85% heat recovery efficiency. To achieve the highest Code for Sustainable Homes level, a SAP heat loss parameter (HLP) of 0.8W/m2K is required. This will not be achievable without MVHR. Our integrated systems help our customers to achieve higher levels of the Code for Sustainable Homes and the best possible SAP ratings.

TI 9006 Underfloor Heating & Surface Cooling

Underfloor heating systems can be designed to react very quickly to heating demands. The warm-up time of the system depends upon several factors. The time taken for the underfloor heating system to emit heat is dependent on the characteristics of the floor in terms of the construction, pipe centres and the floor finish and also the temperature of the water used in the underfloor heating system. Underfloor heating with pipe embedded in a thick concrete slab will have a longer warm up time than dry construction systems such as those used in suspended, batten or floating floors. This is recognised in SAP with timber floor underfloor heating having a better overall SAP rating than concrete underfloor heating. The room warm-up time is also dependent on the heat loss of the building. The underfloor heating system must be sized to overcome the heat losses of the building but also have additional capacity to ensure a good response time from cold.

All types of floor finish can be used with underfloor heating providing the resistance of the finish is considered. A highly resistive floor finish will slow the flow of heat into the room. Typical floor finishes such as timber and carpet are regularly used with underfloor heating. Some finish manufacturers stipulate maximum surface temperatures, underfloor heating has a floor surface temperature of approximately 26°C for most applications however some systems where the building heat loss is high will have surface temperatures up to 29°C. Underfloor heating systems should not be designed to operate at floor surface temperatures higher than 29°C. If your intended finish is greater than 1.5 Tog then please call us and we will check the performance of the underfloor heating.

TX 106 Screeded Floors

There are many different types of screed from the conventional sand/cement screed to proprietary liquid screeds. The screeds that are discussed here are floating screeds i.e. they are not bonded to the concrete subfloor. Sand/cement screeds – The minimum thickness of a floating screed is 75mm for commercial installations and 65mm for domestic installations. There should be a minimum of 25mm screed over the pipes (BS8204-1). Calcium sulphate and anhydrite screeds – The benefit of using this type of screed is that the drying time is less than conventional sand/cement screeds and there is less shrinkage. The minimum thickness of a screed in a commercial installation is 40mm and 35mm in a domestic installation. There should be a minimum of 25mm screed over the pipes (BS8204-7). Pumpable self-smoothing screeds – There are many proprietary screeds on the market. Advice should always be sought from the manufacturer.

TI 6003 Servicing & Commissioning for UFH Systems

Maintenance of the underfloor heating system is straightforward. There is no specific maintenance required for the heating system other than that needed for the boiler or heat pump. The circulator, actuator valve and mixing valve are the only moving parts and these are designed for continuous operation over many years. Once commissioned, MVHR systems need very little service. In all of the Heat Recovery Units (HRUs) there are filters that need to be changed, the filter for the HR01WB wall unit should be changed every 18 months, for the loft units the filter needs to be changed every 5 years.

All Timóleon Systems are designed to be easy to install. Our products can usually be fitted by the usual site personel. However we do offer on-site training for any installer who is new to our system and of course our team of project managers are available to answer any questions as the system is installed.

Timóleon provides comprehensive underfloor heating designs for all of the systems that we supply. Drawings will be issued for approval prior to materials been delivered on site. The designs are produced in accordance with BS1264.

Timóleon has a strict policy of quality control in all aspects of its business from design to product manufacture. We adhere to the British Standards where they apply to the designs, products or systems that Timóleon manufactures and produces. Timóleon systems have been tested for performance with BSRIA and TRADA where appropriate.

The polybutylene pipe used in Timóleon systems is tested to BS7291 class S and is guaranteed for 50 years.