Weather compensation ratios

[@normanboyes4983]

Very well explained Andrew. I have my all rad system running at 1.2 and a set point of 17 (no room reference) my house on an average of six bluetooth thermometers is 19.5C (which we are comfortable with) in the heating season.

[@andrewmillwardwatford9410]

If you've got your set point at 17 and your room temperature is 19.5 you have the wrong ratio. Try reducing it to a ratio of 1

[@waynetully8997]

Very informative and well explained

[@andrewmillwardwatford9410]

Thank you

[@HowardBurgess]

Thanks for explaining what this number actually represents. In general, what causes different emitters to need different curves? Is it related to the overall surface area (hence UFH usually less than radiators)? I can see that a better insulated property would require a lower curve. For each degree colder outside, it requires only a little extra heat energy; whereas a poorly-insulated property would require comparatively more. I just haven’t got it straight in my head about the differences in emitters.

[@andrewmillwardwatford9410]

This is a little bit complicated because a lot of factors kind of overlap. The curve selected does not have any Direct relationship to the insulation values of the property. So my Victorian end of terrace house could run at a lower Curve then a brand new house simply down to the sizing of the emitters. Where insulation has an impact required to match the heat load. So for example two rooms identical sizes could use the same Curve if the less insulated rum has a bigger emitter. In this case both rooms could provide the same level of efficiency but the better insulated room would use less energy. It's important to be precise without terminology if we want to understand these relationships.

[@andrewmillwardwatford9410]

Now to confuse you more. If we were talking about installing underfloor heating in a bathroom or a kitchen we could find that a radiator requires a lower Curve than the underfloor heating so it is not the type of emitter that decides the curve although it is a big factor

[@michelelenci]

It all mainly depends how the underfloor heating was built. Some radiate more than others. The flow temp of an underfloor heating is actually depending on the radiating power of the underfloor heating. Not on the heat source.

[@andrewmillwardwatford9410]

I don't understand your point can you explain more

[@bornnieqc9117]

2 videos in one night 👍

[@mgbroadsterJ]

Do you need mixers If you ha e ufh and radiators ?,

[@andrewmillwardwatford9410]

If it's a gas boiler then you must certainly do need them but on a heat pump probably not. I haven't actually done this in real life on a heat pump so I'm not sure. I think on a Disney pump you wouldn't need to