Potential systems without a room stat

[SJB060685]

If you were home all day and most rooms were occupied/needed to be at a constant comfortable temperature then I would suggest something like a Viessmann 200 with weather comp. Based on your sporadic occupancy though I would suggest something like Evohome as Shaun mentions above.

 

[awkwardcustomer]

The evohome sounds like the most practical way forward, which is a bit of a shame given the maintenance overhead and landfill of batteries in all the TRVs being replaced every 18 months but it's maybe as good as you're gonna get.

I looked into lockshield valves and rebalancing thanks, Shaun. Even with TRVs in the system might dialling in each radiator using the lockshield contribute something? I.e. if I can maximise the flow through the rads in the colder rooms in the roof, compared to the others it might mean the heating/cooling cycle isn't so asymmetrical - e.g. some central rooms getting hot and staying hot while the cooler rooms have long frozen. I guess it'll inevitably mean the hotter rooms take longer if I've throttled the flow, though.

What a shame there isn't a reliable system that uses feedback directly from mechanical TRVs as it would be so much simpler! It does leave you vulnerable to a failing TRV, but the worst that could happen is that you find it's too hot and get it serviced.

 

[ShaunCorbs]

In the colder rooms sounds like the radiators might not be sized correctly

 

[king of pipes]

Maybe the time to up size a few rads in those colder rooms then as advised above look at the viessman 200 boilers with weather compensation built in, you can control your boiler through a app on your mobile device It can be used without a room stat if you wish . Kop

 

[awkwardcustomer]

In the end I have been quoted for either a Veissmann 100-w Combi 30kW (with built-in magnetic filter) or an ATAG IC Economisor 27 (with a filter as an extra) both would be fitted with an outside weather sensor as interlock, and neither would be fitted with a Room stat. They are both around £2900 to fit. They are also advising a power flush before the new fit (the previous was a failed Ideal Logic Combi 30) for an extra £350. Any reason to choose between these two?

 

[ShaunCorbs]

Viessmann as atag don’t have any manufacturer warranty engineers it’s all down to the installer, ok if the engineer is part of this but some arnt

 

[hometech]

Radiant temperature. Elephant in the room? – John Cantor Heat Pumps

In a cold un-heated exhibition room at the Centre for Alternative Technology many years ago, there was one of those good-for-your-posture kneeling chairs. Surrounding this chair was a curved hardboard sheet covered with Aluminium foil. You were invited to sit, surrounded by a shiny foil...

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[hometech]

Radiators – John Cantor Heat Pumps

NEW.. Try this simulator click here Commonly called a ‘radiator’, this simple steel ‘envelope’ of hot water will actually convect more heat than it radiates. Warm air rises from it, and some heat radiates to anything in its sight. Radiators are often the only option simply due to the lower...

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