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New boiler suggestions
Comments
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Anything that uses eBus/PlusBus is not even a contender. The Worcester Bosch EMS bus, although proprietary, has been reverse engineered. With the EMS-ESP project, I can exchange data with my home automation system, but compatibility is not assured if WB has made changes to the EMS protocol or boiler. Then again, OpenTherm is open to interpretation by manufacturers so full functionality is not guaranteed.BUFF said:
Except 200 series which use a proprietary eBus, PlusBus.john.h said:
Viessmann you don’t need to get one with a hot water storage tank, there is a couple of types. They also work fine with opentherm, it’s in the instructions manual. Mine has been running on Opentherm for about 18 months now.FreeBear said:Viessmann - Plus points. Stainless steel heat exchanger.Negative points - Built in HW storage tank (46l ?). So presumably this needs to be heated before hot water can be delivered to the tap. Documents are very vague (read non-existent) about OpenTherm compatibility or wiring up an interface. Looks like "cover off" to gain access to the connectors, therefor Gas Safe engineer required.Intergas - Plus points - Good documentation about connections and is OpenTherm compatible. Access to the PCB is via a drop down panel. 10/12 year warranty.Negative points - Parts, expensive (ouch). Copper/aluminium heat exchanger (looks pretty robust though). Reliability issues with water ingress damaging the PCB (would a conformal coating help ?).
Bear in mind that the proprietary systems of Vaillant, Viessmann & Worcester Bosch will all do at least as good a job as OpenTherm in terms of controlling modulation (indeed there is apparently some evidence to suggest that they may be very slightly better).
Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.0 -
Another alternative that has been suggested by a local installer - Navien - Can't see much in the way of reviews, and suppliers of spare seem to be few and far between.. Any thoughts ?
Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.0 -
Hi FB.FreeBear said:Already have a location in mind to install a combi - Something around 25KW should suffice.
Cold water flow rate is ~10l/min...
Are you saying your incoming CW flow rate is 10lpm?0 -
Yup. As measured at the tap by way of timing how long it takes to fill a 5l container (31 seconds).ThisIsWeird said: Are you saying your incoming CW flow rate is 10lpm?
Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.0 -
Surely that's completely inadequate for any combi?0
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10-15l per minute is typical for most houses in England & Wales. At 10l per minute, a 28-30KW combi is (apparently) recommended. If you have a lower flow rate, then a smaller (say 24KW) boiler would be suitable.
Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.0 -
Hmmm.
That pitiful (soz - now't personal, like) flow rate needs to be shared betwixt H & C.0 -
What's the delivery pressure like?0
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Dunno. Would need to find a decent pressure gauge and test.ThisIsWeird said:What's the delivery pressure like?
Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.0 -
and take your flow rate at different times of the dayFreeBear said:
Dunno. Would need to find a decent pressure gauge and test.ThisIsWeird said:What's the delivery pressure like?
plus is the tap you are using for the test, does it have any restrictions fitted, ie cheap ballofix instead of a full bore valve. Thin/ narrow flexible tap tails.A thankyou is payment enough .0
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