We installed a hybrid heat pump water heater in Florida and they are taking over there from solar thermal due to lower install costs. Incredibly cheap to run in the warm climate there!I suspect it won’t make any economic sense unless you were using a heat pump rather than an immersion heater
So do you use electric immersion over the summer? It's doable I suppose if you only need one tank heated overnight and are on a cheap overnight rate, but is swings and roundabouts as you pay more for your day rate on all those tariffs.I'm not sure that gas is cheaper.... how much heat is lost to warming up the boiler and the volume of water passing round the loop and any losses in poorly lagged pipework. I have an oil system, I hear you say oil is expensive.. you won't hear oil burning households complain these days... but by the time I have heated a huge chunk of metal and over 30 litres of water in a 28mm pipe circuit I won't burn oil in the summer even at 3p a kWh. Last year I bought at 1.7p a kWh and whilst the price is higher now c 3.8p kWh there is only a small difference in the fraction between Jet fuel and domestic kerosene, and there isn't a great demand for the former at the moment. Of course, it is on my conscience that my heating system produces so much CO2, hence my investigation into a heat pump. Go or Go+ with a cheap overnight tariff could offer heat at less than 2p a kWh.
I use the immersion when the heating system isn’t in use. We have a 160 litre hwc so 5 or 6 kWh gives us a tankful. And despite having 3 bathrooms currently there are just 2 of us rattling round the place. The tank is well insulated and holds the heat all day. We use a dishwasher and a washing machine which are cold fill. So the thermostat on the immersion heater is set high and supplies bath and a shower each evening. We do have one unusual feature which is a pumped hot water circulation system to feed the kitchen, utility room and 2 showers. That can quickly reduce the temperature but not many households will have one. If I have some washing up to do, baking tins etc, I’ll boil a kettle to top up tepid hot water later in the evening. When the heat pump is installed we will have a 300 litre cylinder heated by a 12 to 14 kW heat pump. We also have a large kitchen with underfloor heating. The heat pump is likely to be pressed into heating that through the night, which will demand about 6 kw. Sadly I sometimes st by the boiler with a stopwatch measuring demand of the heating system!So do you use electric immersion over the summer? It's doable I suppose if you only need one tank heated overnight and are on a cheap overnight rate, but is swings and roundabouts as you pay more for your day rate on all those tariffs.
I get there are pipe losses in using a boiler, but equally there are losses in heating water at 6am that you might not use until 9pm. Haven't a clue which is the greater though, but I'd still wager oil at 4p per kWh would still be cheaper than electric at 12p?
I wondered how my gas combi was performing, so it now has temperature data logging on it. Sad, not so old man here!Sadly I sometimes st by the boiler with a stopwatch measuring demand of the heating system!
Nice that I can admit to being a sad old man amongst friends here!
Been paying less than than 11p a kWh with Symbio energy for several years now. Octopus is around 14-15p in my area at least, which is pretty average.I could not find a reputable supplier who offered a standard tariff for much less than the Octopus Go day rate we were paying. Have you?