Here are some of my warning notices that I made to help cover myself when providing an estimate to a client. Please feel free to use these as well.
POWER FLUSHING NOTICE
Upon the installation of the new boiler, it is essential that the central heating system is flushed in order to prevent sediments of iron oxide, rust and sludge entering the new boilers heat exchanger. This in turn helps keep the validity of the 5 year guarantee provided by the manufacturer. Power flushing may expose leaks from weak corroded joints upon the cleaning process. Any repairs needed will be charged separately from this quote at current rates.
NOTICE ABOUT WATER FLOW RATE
Upon the visual inspection of the premises, it was noticed that the water flow rate which was measured from the existing water main, is actually below the recommended 20 to 16 litres per minute. This may affect the efficency of the boiler and the performance of the hot water supplied to each outlet.
The alternative to avoid this situation is to have a cold water storage cistern installed the loft which feeds a single impeller pump, that is then pumped directly into the boiler.
This however is not included in this estimate. Should you request the alternative, a second estimate can be provided.
Should any unforeseen or additional work be required, they will be brought to the clients attention and charged seperately from this estimate at current rates.
NOTICE ABOUT PRESSURE TESTING THE EXISTING CENTRAL HEATING PIPE WORK
As we are converting an open vented central system to a sealed central heating system, we need to carry out a pressure test on the existing pipe work throughout out the property to ensure that the pipe work can with stand the high pressures of a sealed system, therefore it must be understood, should the pipe work fail the pressure test and leaks are exposed as a result, work required to resolve these issues will be charged separately from this estimate at current rates.
NOTICE ABOUT PRESSURE TESTING THE EXISTING HOT AND COLD WATER PIPE WORK
As we are converting a gravity fed indirect hot and cold water system to a direct hot and cold water system, the existing pipe work throughout out the property will be pressure tested to ensure the pipe work can with stand high pressures.
In the event the existing pipe work fails the pressure test and leaks are exposed as a result, work required to resolve these issues will be charged separately from this estimate at current rates.