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The figure came out of the 40CDi brochure. You are not the first to comment on the high heatloss. The property has 180m2 and 565m3 of air due to 4,1m ceilings. There are two internal patios and 20 balcony windows 2,1x1,5m. Calc based on following materials: Windows 1,50 W/m²K Ext wall...

I’m wondering whether to install MLCP or copper to feed radiators. We could run copper along the skirting board but there are sections it would be best to hide the pipes altogether. I’m happy using MLCP above ceiling where we can get at it if necessary but not sure about embedding it. I can’t...

there manual is here if you can read Spanish: http://www.scribd.com/doc/45946690/Manual-Roca-RSI-20-20

Roca is principally known for its bathroom suits but they have a venture with Baxi. The boiler is most probably theirs: UK Boilers Jocelynne Rowan, Baxi +44 (0)1926 478291 [email protected]

Looking again, the areas of high pressure are at the end of the friction tables but there are figures so I guess the MLCP is certified to these levels. Perhaps the only issue will be noise? (water moving at a higher velocity) I'm assuming that the worst case is 11 K (82°C/71°C), the aim would...

I would appreciate some help in evaluating a pipework design for a CH system which needs to distribute a max load of 22kW (when the outside temp falls to -5). We plan to use Uponor MLCP and run the main distribution in a ceiling so there is a 1,5m rise at boiler and a 3m drop to each local...

The Bosch 40CDi has a hot water flow rate of 20 - 25 litres per minute @ delta 35ºC, its surprising you are having problems with two flows. We presently have a Bocsh water heater (19kW) with flow rate of 11L/m @25 and we can shower and use at least one tap at the same time. Do you have...

which combi do you have? The spec I haev here is for 24kw max for heating (80/60) and 30KW max for hot water.

hi tony, we have 180m2 with about 565m3 of air to heat. The heatloss calcs give between 16,4 and 20,9kw depending in the wall and roof material assumptions. The roof is shared and cannot be insulated easily. The other issue is marble floors.. The combi boiler we are considering has a micro...

thanks- the problem is we need to compare the costs of gas system with "biomass" (a boiler that uses wood pellets or olive stones..) to choose..

OK not questioning the physics here, there is something about the way performance is being specified. For example, Vaillant in Europe specifies performance as 98-109% but the English website states an “efficiency of over 90%.” So, it is wrong to assume 100% conversion from gas burnt to hot...

Ups. so is this where I find out I have missed something big. :o Here is a selection of condensing boilers that have performance claimed at 98-109%: Ferroli Econcept Tech 25 C Saunier Duval Isofast Condens F 35 Saunier Duval Isofast Condens F30 Vaillant ecoTEC PLUS VMW ES 346/3-5...

Hi, we are about to install gas CH and would appreciate some help in estimating the running cost. We have a gas water heater at present and so are looking at changing to a condensing combi boiler and adding radiators (under floor heating is not possible in our case) I guess a typical...

Thanks for the info, its an interesting system but I think fitting each radiator with a thermostatic value will be sufficient in our flat. Perhaps I am not using the right terminology. We are really concerned with the distribution of hot water rather than the control of heating in various...

hi dcawkwell, there are 16 rads and 3 towel holders, two of which are at the far end of the flat which has 550m3 of air to heat. I guess that's at the limit? Does the amount of water flowing factor into whether to zone or not? I estimate there will be 50L of water in the tubes, 50L in the...

Hi, we are about to install a new central heating system and have received a couple of proposals. I would really appreciate some input from forum experts as to the best design. We have a long narrow flat around 27m at its longest point. The pipes need to run above a false ceiling about 3m...