Heat only vs Combi boilers control- set flow temperature
- Thread starter tellme_why
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Presumably you were at home Sunday, out Monday and Tuesday? I'm home most days and using small amounts of water throughout the day.
Someone is in the house all day long most days. In any case, most of our gas usage will be in the evening when we cook and have showers.
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nice app - it shows the actual energy
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Your gas meter is probably passing unregistered gas.
Why do you say that?
You can't have the amount of hot water you're using for 37p a day.
I can and I do.
1 kwh of gas boiler heated HW will give 15L if heated from 10C to 60C resulting in 25L of shower/bath water at 40C so easy to work out how much water is reheated once cost/kwh is known, this assumes a mains temp of 10C, at the now mains temp of 20C these numbers become 19L & 38L per kwh of gas consumption.
The vol of water used before reheat is largely determined by the positioning of the cylinder stat, the higher up on the cylinder, the greater the volume to reheat and the less the frequency but a longer reheat time obviously.
The vol of water used before reheat is largely determined by the positioning of the cylinder stat, the higher up on the cylinder, the greater the volume to reheat and the less the frequency but a longer reheat time obviously.
Yes; is your boiler OpenTherm? If so use EPH controls and set for priority hot water reheat which it will do at high temp (set to whatever reheat temperature you want, say 75degrees) then when hot water is up to temperature supply space heating at a modulated flow temperature dependent on current demand.
If you set for simultaneous reheat of both the control will choose the highest but time the two reheats to be separate and it's the easiest and cheapest option for any OT boiler. If the boiler software permits (most don't) you can also introduce weather compensation. If you use the EPH Ember that offers remote control of system and boiler.
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.. Hi.. I found out that I can achieve same result by fiddling with weather compensation thermistor. I just modify the thermistor resistance by external relay and can change the supply water temp.. much simpler than opentherm .. 
.. Hi.. I found out that I can achieve same result by fiddling with weather compensation thermistor. I just modify the thermistor resistance by external relay and can change the supply water temp.. much simpler than opentherm ..
Yes, that's what we do on basic boilers, simpler but chalk and cheese. If it gets the job done however, go for it.
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