- Messages
- 105
Just thinking... my new boiler (a Viessmann) was installed without pump overrun, apparently it's not required because it has a stainless steel heat exchanger, but when the burner cuts out I see the temperature slowly rise (as reported by the boiler) to around 95 degrees, I assume this is the latent water temperature in the hex.
But what I am wondering is if this means the water is (close to) boiling could this eventually cause issues with kettling later on down the road, or maybe mineral deposits building up in the hex as the water is repeatedly boiled? I'm assuming Viessmann don't see it as an issue else they would enable pump overrun by default, but I just can't get my head around the temps I am seeing and have that little niggle in the back of my brain that in a few years time I'll start hearing those tell-tale kettling noises.
Does anyone have long term experience of this? I am wondering whether to get pump overrun installed anyway (at my own cost) to keep the latent temp in the hex down after the burner shuts off and safe guard the hex against potential kettling.
Maybe I am just thinking about it too much!
But what I am wondering is if this means the water is (close to) boiling could this eventually cause issues with kettling later on down the road, or maybe mineral deposits building up in the hex as the water is repeatedly boiled? I'm assuming Viessmann don't see it as an issue else they would enable pump overrun by default, but I just can't get my head around the temps I am seeing and have that little niggle in the back of my brain that in a few years time I'll start hearing those tell-tale kettling noises.
Does anyone have long term experience of this? I am wondering whether to get pump overrun installed anyway (at my own cost) to keep the latent temp in the hex down after the burner shuts off and safe guard the hex against potential kettling.
Maybe I am just thinking about it too much!