Direct Running Cost Comparison
LPG (Propane) v Kerosene
Kerosene:
Typically 34,361 Btu/Litre                                                              or     2.91 Litres/Therm
For 225,000 Btu (SS225XL Heater)                                                                   =       6.55         Lt/hr
Assume  75%     efficiency heat output averaged
over period between services                                                               6.55       =       8.74/        Lt/hr
                                                                                                                            0.75
Current price Kerosene (2)   32 pence/Litre   x   8.74     =              £2.80/hr Fuel running cost
Propane:
Typically 24,004 Btu/Litre                                                              or     4.17 Litres/Therm
For 225,000 Btu (SS225XL Heater)                                                                   =       9.37         Lt/hr
          Assume  95% (3)  efficiency heat output averaged
          over period between services                                                               9.37       =       9.86         Lt/hr
                                                                                                                            0.95 
Current price Propane (2)     26 pence/Litre   x   9.86     =              £2.56/hr Fuel running cost
(1) These prices were taken from major UK oil/gas suppliers during 2007. Other suppliers may offer different prices, but are unlikely to vary by more than 10%.
(2) Oil fired heating efficiency is difficult to determine, due to its reliance on regular servicing. Most oil fired heaters would deliver approx 90% new falling to approx 70% after 6 months use, and as low as 50% if un-serviced for 12 months. This can lead to high levels of unburned air borne droplets causing pollution,  and can damage produce, burning into the growing plants.
(3) Gas heater efficiency is generally good at start (over 95%) and unless something serious happens (dirt/dust clogging airways or component failure) it is normally stays at around 95% even after 12 months without servicing, contamination issues are rare when using gas.
(4) A new Bunded Oil Storage Tank could cost £3,500. Gas tanks are normally supplied & maintained for a small service charge.  Servicing of Oil units almost always takes more time and is therefore more costly than Gas heaters. This is definitely the case with the Maywick SS225 XL as servicing takes a few minutes. 
These figures are for reference and comparison only, Maywick cannot be held responsible for any inaccuracies in their content.
 
 
                                                                                      
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