Electricity on nightsaver costs ~7c a unit. The immersion heater is almost 100% efficient.
Gas is ~4c a unit, but the boiler is only about 75% efficient. So it's over 5c to get 4c worth of heat.
I too cannot turn off the water to the whole system, so I am heating probably another 150 litres of water (ie double) which circulates in the system. We're now over 10c to get the 4c worth of heat.
Heatloss from the water circulating in the system is probably adding another 2c.
Total is now up to maybe 12c.
Not very scientific, but enough to prove nightsaver electricity is cheaper than gas.
You've been hearing too much about babies that don't sleep at night. Nightsaver will only work between midnight and 9.00am (or 11pm to 8 am in winter). Unless you're planning late nights, an electric radiator is going to cost you 14c per KwHr.I have Gas central heating and a rad in every room. If nightsaver energy is cheaper, how much would it cost to convert my system ? It seems like a lot of plumbing would be necessary to remove my old rads etc.
Baby will arrive in September so I need to be ready for the next winter. Any suggestions ?
No, you're not understanding correctly. Gas is cheaper for heating the house, but nightsaver electricity is cheaper in a typical (older) house for heating the hot water.I have Gas central heating and a rad in every room. If nightsaver energy is cheaper, how much would it cost to convert my system ?
It is well insulated, but we all shower in the mornings, with a low-flow showerhead. There is enough warm water left in the evenings to do the wash up. (And that's on "sink"!)quentingargan said:But unless the cylinder is incredibly well insulated, nightsave electricity for 120L (which is a typical cylinder) won't get you past bath-time.
It is well insulated, but we all shower in the mornings, with a low-flow showerhead. There is enough warm water left in the evenings to do the wash up. (And that's on "sink"!)
It actually works out incredibly cheap. 2kW heater, on for 30 mins a day, means 1kW/h a day. 7c x 365 = less than €26 per annum for most of our hot water needs. (If the system was on "bath" it would be 2.5 times the price, or a bit less than €65 a year.)
However if it is cold with the gas on all the time, I would look at insulation, draught-proofing etc. as a start point, rather than plumbing in a second radiator. On the other hand, if the radiator is badly sized, you could just put in a double one to replace a single, or a longer one.
No, you're not understanding correctly. Gas is cheaper for heating the house, but nightsaver electricity is cheaper in a typical (older) house for heating the hot water.
Buy her a big thick jumper and save the planet!
Nightsaver requires ESB Networks to install a dual rate meter. It'll cost you nothing. You get charged a slightly higher standing charge but you get half price electricity at night (11pm-8am in winter, midnight-9am in summer). Use of timeswitches means the washing machine, tumble dryer, dish washer and immersion heater can all be set to use cheap electricity. We have probably reduced our electricity bill by 25-30% by using Nightsaver.Thanks for the explanation. Is nightsaver something you need to ask the esb to change you over to or does it just mean switching on your immersion after midnight ?
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