Opentherm System Boilers for Nest v3

[vulcancontinental]

A surprising umber of my Evo customers have emailed me with savings, around 30% is not untypical.

And I've been using 16 zones since 2003 myself in my own house, so have practical long term experience.

If you haven't fitted one in your house, you of course have every right to be sceptical. However don't let your tardiness put off others unjustly.

It is easy to forget zoning simply makes your house much, much smaller. Of course it will be cheaper to run.

It wouldn't work in a house with every room occupied 24/7, but few of us live in such a scenario.

I was trying for unsure rather than negative and I'm not sceptical, I've just no experience other than installing a couple of systems years ago that I never got feedback from. I hope to snag some of our new stuff coming out soon that will allow me to zone in the place I am refurbishing at the moment but nowadays this is a different proposition with the ability to intergrate the sensors to one controller and then to the boiler.

Not doubting your experience but am fed up with advertised hype promising the world to customers and usually prefixed with the two words 'up to' which is unhelpful.

 

[simond]

The rooms don't even need to be occupied. If the door is left open, heat will enter the room, even if the TRV or thermostat in the room is set to a lower temperature, so eventually all rooms will be at approximately the same temperature.

Yes, of course you are right, I defer to your experience, D_H.

Like a eunach in a harem; he knows how it is done, but has never done it himself.

That's why we've all only got one, single, enormous radiator in our houses.

 

[D_Hailsham]

That's why we've all only got one, single, enormous radiator in our houses.

That's not only irrelevant, it's ridiculous.

I may not have your vast experience, but I know that, even if the TRVs in my bedrooms are set to 2 or 3 - a temperature of 15-18C - so the rads are cold, the actual temperature in the room will be about 21C, which is what the stat in the hall is set to. This because heat from downstairs rises and can easily enter the bedrooms as the doors are open.

 

[Steelmasons]

I may not have your vast experience, but I know that, even if the TRVs in my bedrooms are set to 2 or 3 - a temperature of 15-18C - so the rads are cold, the actual temperature in the room will be about 21C, which is what the stat in the hall is set to. This because heat from downstairs rises and can easily enter the bedrooms as the doors are open.

I doubt it...
Are you suggesting a radiator could be positioned anywhere in a room with no ill effects with regard to wind chill factors?
Radiators should be positioned under a window , although you say the heat gain from downstairs will maintain a constant temperature throughout the house?
My room stat is set to 21c downstairs with all doors open throughout house , with bedroom radiator turned off it can get fookin cold in there along with the wife moaning..

 

[simond]

I can't believe

I may not have your vast experience, but I know that, even if the TRVs in my bedrooms are set to 2 or 3 - a temperature of 15-18C - so the rads are cold, the actual temperature in the room will be about 21C, which is what the stat in the hall is set to. This because heat from downstairs rises and can easily enter the bedrooms as the doors are open.

You know all about weather compensation and offer advice on here, but you've never had it yourself, or fitted it.

You know all about zoning, but you've never done that either.

And the other day you were offering advice on combustion and flues, and showing yourself up with your total lack of knowledge.

I don't know what line of work or specialisation you are in, but those of us on here who do heating and combustion as a vocation aren't fooled, or fools.

 

[Dan Robinson]

I doubt it...
Are you suggesting a radiator could be positioned anywhere in a room with no ill effects with regard to wind chill factors?
Radiators should be positioned under a window , although you say the heat gain from downstairs will maintain a constant temperature throughout the house?
My room stat is set to 21c downstairs with all doors open throughout house , with bedroom radiator turned off it can get fookin cold in there along with the wife moaning..

I can't believe


You know all about weather compensation and offer advice on here, but you've never had it yourself, or fitted it.

You know all about zoning, but you've never done that either.

And the other day you were offering advice on combustion and flues, and showing yourself up with your total lack of knowledge.

I don't know what line of work or specialisation you are in, but those of us on here who do heating and combustion as a vocation aren't fooled, or fools.

You pair of fools. Google and Baxi told him. Ffs didn't you do the whole house method?

 

[shambolic]

I thought you now fitted radiators back to back on internal walls at the dead space at the doors?
Several reasons, heat isn't lost to outside wall.
Can't shut curtains if under Windows and curtains are long.
Less pipe runs.
Can't put furniture in dead space at door.
Have I been boing it wrong then

 

[D_Hailsham]

My room stat is set to 21c downstairs with all doors open throughout house , with bedroom radiator turned off it can get fookin cold in there along with the wife moaning.

I can understand that happening if each rad is just large enough to cover the calculated heat loss from its room; there is no spare heat for upstairs. I accept that my situation may be atypical as the heat loss of my house is only 7kW (improved insulation after heating installed) and there are 13kW of rads, with 8kW on the ground floor.

However, that is getting away from my point that zoning only works if doors are kept closed. When the heat loss of a room is calculated the assumption is made that all doors, internal and external, into the room are closed and there is a heat gain/loss through the walls and doors. How do you calculate the heat loss if a door (internal, of course) is kept open?

 

[simond]

Your 'point' that zoning only works if the doors are shut is simply wrong.

I can't stop you writing untruths based upon your lack of understanding, but why be so adamant in matters you have no experience in?

We fitted OT weather comp to one of the/our first UK Avanta installations, in Balcombe, Sussex. We were filmed by Remeha doing it; our installation was featured in their brochure and a number of trade infomercials.

But I dont claim to be a Remeha Avanta expert.

You know all about this boiler from a sample of 1. You advise others on OpenTherm but have never even installed it to your own Avanta. You know all about zoning from your modest house, although you havent tried it.

 

[D_Hailsham]

Your 'point' that zoning only works if the doors are shut is simply wrong.

Rather than criticizing me all the time, why don't you do something positive and explain to me how I am wrong?

 

[simond]

I'd rather criticize. Anyway, you know you are right.

Tip: Think about heatloss, and temperature gradients.

Also, ask yourself why you believe all the guff about weather compensation but don't believe the guff about zoning. When you have neither.

 

[Steelmasons]

I thought you now fitted radiators back to back on internal walls at the dead space at the doors?
Several reasons, heat isn't lost to outside wall.
Can't shut curtains if under Windows and curtains are long.
Less pipe runs.
Can't put furniture in dead space at door.
Have I been boing it wrong then

Yep....you've certainly been taught by someone who hasn't a clue..

 

[monsterink]

is there a definite list of opentherm compatible combi boilers outhere! pls enlighten us!

most these new ones are modulating, but use propriety protocol. so evhohome and nest cant make talk the same way opentherm compatible ones do.

https://uk.myboiler.com/author/myboiler/

 

[Dan Robinson]

What proprietry controle does the Intergas use?