FPI Solar - Energy Conservation

By: Fpi Solar  05/12/2011
Keywords: renewable energy, hot water, energy conservation

Modern condensing boilers are typically quoted as having seasonal efficiencies of 90% + and if your boiler is 20 years old it’s likely to fall in band F or G in the above table.

While current building regulations require band B (as a minimum) product to be fitted in all new builds, upgrading existing installations is a decision for the home owner. In new builds it’s relatively easy to plan for renewable energy heat sources such as geothermal or solar but in existing dwellings it’s a more expensive proposition as more work is involved.

It makes sound sense in these circumstances to improve the efficiency of the existing heating system rather than replace it and installing a new boiler is often a good starting point. Likewise many older installations will not be zoned or thermostatically controlled correctly and this is work we’re happy to quote for. For a typical central heating system it should be possible to operate radiators in living and bedroom areas independently as well as hot water with or without radiators. Hot water cylinders should be insulated as well as having thermostatic control and all hot water pipes should be lagged.

Upgrading manual timers to 7 day digital timers can also be useful as it allows heating schedules in keeping with the occupancy of the dwelling to be programmed. Another advantage of these is that battery back up is provided during power failures so that on restoration of the supply there’s no need for manual adjustment.

Keywords: energy conservation, hot water, renewable energy

Other products and services from Fpi Solar


Solar Hot Water Systems

In this period there will be minimal need to use back up heating (oil, gas, electricity etc.) and on sunny days water temperatures of 50°C – 60° C would not be unusual. A well designed and properly installed system will provide energy all year round, will be virtually maintenance free and have a design life of 30 years plus.



While we considered several providers we were very impressed with the knowledge and enthusiasm of Matthew Collison of FPI Solar and we accepted his competitive bid for the project. We were very impressed by how neat the work was with Matthew going to great trouble to maximise the space in our hot press once the equipment was installed.


Attic & Wall Insulation

Thankfully there’s a simple and inexpensive solution (in the shape of glass fibre, rock wool, cellulose etc.) but it’s surprising the number of poorly insulated attic spaces we still have. Provide service walkway from access hatch to tanks. Lay 150mm glass fibre quilt between joists. Insulate water tanks and exposed pipework.


Geothermal Heat Pumps for Space Heating

However it’s important to remember that for all heat pump systems one fundamental does not change: The greater the difference between the temperature of the source and the output hot water temperature, the less efficient the unit becomes. The clever thing about them is the way they use electricity to operate a compressor and refrigeration circuit to move heat from a low temperature source to a high temperature source.