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I have a problem with a MAN gas boiler, it has a actuator (driving the divertor valve) that uses a synchron motor. This motor has the same body as a standard Honeywell etc replacement motor but the complication is that the output gear on this motor is about two to three mm further away from the...

Thanks Dan,

Some interesting conversations above but what's the thoughts about my original thread?

Dan, the 30kW UFH requirement came from the suppliers "UFH1" that calculated the heating requirement for the ground floor (300 sq. mtr) The 26kW for DHW was a calculation for a 300l cyl giving a recovery time of around 45min. What I am asking is whether the principal is correct as my house is...

Am I on the right lines with my thinking or am I missing something? If the total heating kW required in a house is calculated at 30kW and the DHW heating requirement is 25kW then a CH boiler sized at 35kW would suffice? (during the time that the DHW was calling for heat say 30 min. there...

Thanks for the input With regards to the SAP statement (Page eight number 8 space htg. requirement from attach. sap below) it shows 4485kWh/mth It must be the way I am reading it because it dosen't stack up, so probably you are right a "brain fart moment" (the up side is that I don't have many...

Please advise, my sap calc's for a new house states I require 4300kWh of space heating in the month of January (38.62kWh / sq. mtr) If I reduce that down to the boiler working say eight hours / day then 4300x8 = 46kW...

Thanks

Dan, the problem I can see with the Rinnai is in this house the distance from the boiler to the farthest hot water outlet is around 20 mtr plus bends etc. with the others outlets between. we were going to run a pumped secondary circuit from the cyl.to give immediate hot water to all outlets. It...

Thanks to all for the response, Dan, the house mentioned is my son and wife's and they want to utilize either oil or gas (hence the question on which fuel "oil or LPG") The reason for considering a 400l cyl. (not cast in stone yet) is basically down to number of bathrooms (five) but it will...

I have a new house requiring heating and DHW installation. 600 mtr sq. Underfloor & rads heating and 400ltr DHW cyl. The DHW will require around 26kW and the central htg. requirement (from sap) will be around 4500kWh in January so I reason that a 26/ 30kW boiler will suffice for both heating...

A quick question about my son's new build The house is quite large (600sq.mtr) with a planned 500ltr DHW tank and underfloor heating on the ground floor with rads on the first and loft floors. The Sap calc's have been done to accommodate an oil boiler for heating, there is no mains gas in the...

Thanks Andrew, I am trying to make 28000 kWh/year work into 30 kW I looked at the Baxi calculator and it gets a bit awkward as this house is rectangle over three floors with a large "wing" built on the side (like an extension) making it difficult to compute (for an outsider) Thanks again Paul

Looking at a new house SAP calcs I require 28000 kWh/yr for total space heating. This is for a 600m sq house (over three floors) does the above equate to a oil boiler size or is something missing? Thanks

I mentioned in the previous thread where there is any mileage in utilizing two boilers in this house, now knowing that oil boilers don't modulate (didn't know that) then two smaller boilers should reduce cycling. Am I on the right track?? Paul

This is a big 6 bed house (580 sq mtrs.) and working on your 50lt / person calc is going to be a 500lt cylinder Underfloor heating to ground floor other two floors over sized rads to heat the rooms using the 60* flow temp of the underfloor heating circuit. Is there any gain in using two small...

A couple of questions re new build and heating requirement Should I have all the info I require to size my central heating requirement from a new house SAP calculation information? The house, having five bath / en-suite rooms plus the rest will require a big DHW tank, because of this I would...

Thanks colzey

I have a 60s bungalow with cracks in the ceilings caused by all sorts of issues that I have resolved so I intend overboarding the existing plasterboard with new. Am I alright using 12mm boards where the board edges will be resting to the existing boards that are not to nailed to noggins or...

Hello members, I need advice on the following please. I have just updated my existing UFH circuit with Heatmiser wiring centre and slimline PRTs and wondering where I should install the O/H stat in this circuit. I was thinking that the o/h stat should interrupt the PRTs stats to zone valve...