Combi Boilers - Users Instructions

Exclusively written by Herts Boilers (2024)

Combi boilers are a good invention. Nowadays

Working hard.

Boiler diagram

About 10% of boiler preoblems are intermittent. Having said that, we are not refusing to work on intermittent lockouts, but we just want to let you know that it might take more visits and cost more to get your boiler finally fixed.

Programmer

Drayton LP522

Hive and Nest,

Programming

70% used by heating

House insulation is't always good.

Still need to programming heating on time to max energy efficiency. When not in home, or in sleep, you are better off to set the temperature down.

System pressure

On most of hot water cylinders, even they are primarily heated by boiler power, but there is an immersion heater for backup purpose.

Gas is still much cheaper than electrical.

Immersion heater is about 3kW, much less powered compared with a gas boiler.

This immersion heater is only for hot water backup, not for heating.

Boiler output temperatures

Both hot water and heating should be about 80-90% of the full scales.

System pressure

Radiators

Leave them all on at radiator valves, control your heating by a centrollised room stat.

Room stat

One centrallised one is surfficent for most of households, plus TRV on each radiator to balance each room temperatures.

There on and off concept anymore, just at what time and you set what temperature.

6pm to 10pm, family time 20

12am to 6am, sleep time, set to 15

9am to 4pm, away from home, set to 10

Holiday away

When you are going away for a three week holiday, always leave your combi boiler on. Image if you leave your car not run for a few weeks, can you re-start it once you come back? It is the same!

Put heating temperature to a lower point, and leave hot water on, these will make boiler and pump run briefly everyday.

Herts Boilers also maintain this blog site: https://www.boilerblog.co.uk/