Is anyone able to help with approx heating cost calcs please? (Kw)
I am looking at 2 options as am completely off grid, don't want oil or lpg gas, so leaves electric only. Don't really want ashp. So my options really are upgrading night storage and immersion heater (currently installed) or installing electric combi boiler and wet central heating, I think this is my preferred option, but Id like confirmation that the cost savings in running (if any) are worth making the change.
So the calc would be 1x combi boiler firing as necessary for heating/hot water, i predict approx 4-6 hours on use per day in the winter, no idea of wattage as its regulating, I believe around 0-14kw with single phase. So maybe 14kw getting heating up to temp then ticking over on 0-2kw to maintain desired temp.
And currently there is immersion heater (no idea of wattage), 4x 3 element night storage heaters (believe each element is around 750w?) These are currently running off peak on econ7 tariff, so on for 7 hours per day. And a 2kw heater in bathroom for blast of heat on demand, maybe 30mins-1hr use per day. I should add as well that occasionally this system has to be topped up with on demand electric to boost room temps to desired level.
Should add there is an electric shower for daily use, which will be staying and not effect calcs/demand, so immersion and combi would only have to heat water at 3 taps (plus addition of wet radiators for the combi).
I am thinking if I go the electric combi route there are potentially cost savings, plus increased comfort levels and convenience of instant hot water on demand and being able to get rid of the immersion tank and update the controls with room stat and trvs etc. Is anyone able to help/confirm with the kw calcs please?
Also does anyone know the effect on the epc with night storage vs electric combi boiler? Would one likely be more favorable? I would assume the electric combi due to room stat and trv controls. Is it calculated on total kw usage or on assumed econess of the system? Ie extra brownie points for systems that make use of renewable energy/solar etc.
Thanks in advance!!
I am looking at 2 options as am completely off grid, don't want oil or lpg gas, so leaves electric only. Don't really want ashp. So my options really are upgrading night storage and immersion heater (currently installed) or installing electric combi boiler and wet central heating, I think this is my preferred option, but Id like confirmation that the cost savings in running (if any) are worth making the change.
So the calc would be 1x combi boiler firing as necessary for heating/hot water, i predict approx 4-6 hours on use per day in the winter, no idea of wattage as its regulating, I believe around 0-14kw with single phase. So maybe 14kw getting heating up to temp then ticking over on 0-2kw to maintain desired temp.
And currently there is immersion heater (no idea of wattage), 4x 3 element night storage heaters (believe each element is around 750w?) These are currently running off peak on econ7 tariff, so on for 7 hours per day. And a 2kw heater in bathroom for blast of heat on demand, maybe 30mins-1hr use per day. I should add as well that occasionally this system has to be topped up with on demand electric to boost room temps to desired level.
Should add there is an electric shower for daily use, which will be staying and not effect calcs/demand, so immersion and combi would only have to heat water at 3 taps (plus addition of wet radiators for the combi).
I am thinking if I go the electric combi route there are potentially cost savings, plus increased comfort levels and convenience of instant hot water on demand and being able to get rid of the immersion tank and update the controls with room stat and trvs etc. Is anyone able to help/confirm with the kw calcs please?
Also does anyone know the effect on the epc with night storage vs electric combi boiler? Would one likely be more favorable? I would assume the electric combi due to room stat and trv controls. Is it calculated on total kw usage or on assumed econess of the system? Ie extra brownie points for systems that make use of renewable energy/solar etc.
Thanks in advance!!
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