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Vince101, you might want to look at insulating your walls and improving the loft insulation as doing so takes your whole house boiler size down from 18kW to around 12kW!! :idea: :) Most people on here tend to use this calculator to work out the Whole House size and take a look at this site...

A little bit of research reveals the following: 2001 - Vaillant Group purchase Hepworth plc and with it, take ownership of the Glow-worm brand. Sept 2006 - Vaillant launch ecoTEC Plus 400 series (Press Release) March 2007 - Glow-worm launch Ultracom hxi models (Press Release) My own...

I hope all is well and we see you again on here soon! :) exocet, I believe that without an "intellegient" control such as the VRT392/VRC430 the ecoTEC boilers WILL modulate based on the return water temp. i.e. lower the gas kw/ouput as necessary However, this will be based on a static...

There's also the nice "Simulator" here which is currently showing the v2.15 firmware options, not sure if they keep it updated...

I believe Vaillant manuals are originally written in German, then translated to other languages. There are a number of translation anomalies in various manuals, this may be another one!? In the German manual, C8 options are described as "keine, Auf-schaltung, Thermostat" or according to...

Am I correct in assuming Vaillant use the same main board / firmware on the 600/800/900 as the 400 series? Do they have an "official" fix for this bug in the firmware? (over shoot on low flow temps); I understand there is a change that can be made by senior Vaillant engineers to fix it? Hmm...

Where's the "modulating" setting on the 430f? I have the VRT392 which is a 'newer' control and I thought the firmware was similar (with added outside temp) to mine, however, after reading the 430 manual again, it seems to be very different in how it controls the heating. (My statements above...

Really? [goes off to re-read the manual] ... oops, sorry, looking at the latest manual here for the VRC430f I'm even more confused!! It sounds like when set to "Thermostat" mode, it's reading the room temperature as well as Weather Compensation (outside temp) but I can't find any reference...

The difference is increased efficiency... when in 'modulating' mode, the controller will tell the boiler what temp it wants the water to reach to achieve, then keep the room temp you set. In thermostat mode, the boiler just heats up the water to the temp you set on the boiler, even if the...

Successfull (mass market) product designs tend to follow the KISS principle, having 1,600 setpoints is 1,500 too many IMHO and just shouts "overengineering". If a consumer really needed that many variations in a week, much better solutions could be developed using intelligent technology such as...

Besides me being a "DIYer", my day job for many years has been professional R&D in technology products, including interface design.. during which time we have conducted usability studies with 1,000's of consumers and sold millions of products! :wink: The heating industry appears to be stuck...

I found the manuals in the "discontinued" section of several sites and couldn't see them for sale... Are you sure your not thinking of the old one dial Vaillant controls and/or problems with Weather Compensation? The VRT392 for example was only released in June last year!! True, the...

Is it a pain to keep every door closed!? :wink: I see Honeywell discontinued the Hometronic system (too complex for most home users?) and replaced[?] it with the much simpler CM Zone system... I do agree that things should be much easier for the consumer. Tomorrows (todays?) home buyers...

:? :roll: Out of interest, what controller do you use at home simond? And is it the weather compensation on the VRC430 they find difficult? (I've seen many threads on here where customers and RGI's don't understand WC) - The VRT392 doesn't have WC so is setup/operated in a similar way to...

As a customer (user) that has changed from a Honeywell (and previously a Danfoss) control to the Vaillant VRT392 I have to say we find the VRT392 *very* easy to use. I think that the *old* Vaillant controls (the one's with only one control dial) were not very intuitive, however, the VRT 392 /...

Yes, I do. I'm now getting 12C delta (with cylinder valve half closed) on d.40/41 until the flow temperature reaches 70C, the boiler then modulates down and so does the delta. Using the formula Flow (l/min) = Power (kW) ÷ 4.1 (kJ/l/K) * 60 (s/min) ÷ ΔT (K) gives me a flow rate of 12.19...

Okay, a quick look at the gas prices in my spreadsheet reveals if I lowered by usage back to the old boiler's levels (-20%), I would save £16 over the summer.... so could perhaps even afford a McFlurry as well for the kids!! :lol: Seriously, I guess I was looking too much at percentages and...

I've now dropped the cylinder temp to 54C which if 831Bunny is correct, will mean the flow temp will be 54+15=69C. I have turned back the balancing valve to half way and will check later to see what my delta temp is on flow/return. I've been trying to find out what my cylinder will absorb...

Okay, results from this morning compared to yesterday and a previous 15yr old 18kW open vent, non-condensing boiler from last year with same cylinder but using a tank stat rather than VR10: Yesterday vs Today = +7% more fuel Old boiler vs Today = +21% more fuel Todays settings were...

The cylinder is copper with foam insulation, approx 15 years old. Understood, I come from a R&D background in technology so can guess what they will likely go through during NPD! ;) Products are usually designed for a range of scenarios/installations. During R&D a 'happy medium' setup is...