How Long Are Heaters On For Each Day

[fry_lover]

found this tool where you can work out how much each fish tank costs on you on the eleccy, but the only part of the tank which is unpredictable in electricity cost is the heater, as it goes on and off (suprisingly!!)

i am just looking for peeps to give me a rough idea, someone must have some idea (roughly)

Obviously main thing is time of year and temp of house,

how about 2 guesses, one for summer, one for winter?

i'll pick on of my tanks for you and you let me know how long each day you think the heater will be on for in total

Tank, 300 Litres

Heater, 200 W

Location, London UK, assume "average / normal" use of central heating and "average / normal" room temps


PS - anyone got any tips / ideal forumula's for tank size and heater wattage required?

i.e. 300 litres = what Watts?

 

[Samphire]

I think of the heater as using the same leccy as a bulb - 100 watt bulb on and off during the say not to bad on leccy 200 watt heater going on and off bit like two 100w lights being popped on and off during the day. I use the same principle for slow cooker lol.

 

[samyboy]

the heaters usually say on the box what volume of water they should cope with