5 bed, 3 en suite shower rooms, 1 bathroom. dont want cyl just combi.been looking at gw xtramax and worcester 440 and 550.
which boiler
- Thread starter fitz1
- Start date
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are they mixer showers or electric in the ensuite?
is there a shower in the bathroom?
is there a shower in the bathroom?
mixers and maybe
3 maybe 4 showers
bath
4 whb
kit sink
more than likely a utility room with a sink aswell
im out
bath
4 whb
kit sink
more than likely a utility room with a sink aswell
im out
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D
Deleted member 105431
rinnai twinflow is perfect for the job.
http://www.rinnaiuk.com/5_Downloads/3_Corporate_Downloads_PDFs/4_Twin_Flow_System.pdf
http://www.rinnaiuk.com/5_Downloads/3_Corporate_Downloads_PDFs/4_Twin_Flow_System.pdf
G
GeorgeBramwell
Look at the high flow ATAG. Not cheap but good and cheaper than boiler/cylinder all told. It is cheaper than the Rinnai Twinflow which is expensive as it is a two appliance setup - but good.
The Ethos combi is good, look at that.
rinnia twinflow will be your best bet. but it is not going to supply 4 showers at once. two good showers or maybe 3 poor ones but not 4.
but on the plus side the rinnia will never let the hot water go cold. it will automatically restrict the flow two stop that.
now if you could some how pre-heat the water going to the rinnia, via a small tank maybe then you could get 4 showers for a time.
but on the plus side the rinnia will never let the hot water go cold. it will automatically restrict the flow two stop that.
now if you could some how pre-heat the water going to the rinnia, via a small tank maybe then you could get 4 showers for a time.
the rinnai water heater that goes with the twin flow is 54kw and that is about 20 l/m @ 35 degree rise. to get two combi working on what a u6 meter can give is not going to gain you much more...
now you can get a 69kw rinnia but that would mean upgrading the gas meter. to get all them running at the same time this bloke is going to have to have some sort of stored water, even a small tank to pre-heat the dhw to 20c going to give 26l/m at 45 degrees temp at the tap.
now you can get a 69kw rinnia but that would mean upgrading the gas meter. to get all them running at the same time this bloke is going to have to have some sort of stored water, even a small tank to pre-heat the dhw to 20c going to give 26l/m at 45 degrees temp at the tap.
G
GeorgeBramwell
The Twinflow is an ATAG boiler and Rinnai multi-point all in one frame. You can specify a larger flow rate Rinnai multi-point. As you have noted the 54KW multi-point only gives 20 litres/minute. as it not a condensing boiler. The ATAG high flow combi and the Ethos both do around 24/25 litres/min.
Rinnai put in a flow switch to cut out the boiler when DHW is called. This keeps the gas rate below the maximum of the U6 meter. Anyone can do this themselves with an off the shelf flowswitch, which is all Rinnai are doing and I have done this in the past. If you go to a larger U16 meter and mains supply pipe, you may as well just have the larger Rinnai and a cheaper separate boiler and no flow switch as the gas supply will cope.
In this situation, if 4 showers have to be run at once (this will be a rare event) and there is no upgrade to a U16 meter, then it is best to consider two combi boilers sized just below the 6 cu metres of the U6 meter. This will do it and the cheaper option. a 28 and 30 KW will usually be below the 6 cu meter/minute of the U6 meter. The house is big enough to zone up the heating and have a combi do each floor. If a fast bath fill is needed then joining the DHW outlets with non-return valves can be done only for the bath run. The two units can be above each other and quick to fit as both are in the same location.
Rinnai put in a flow switch to cut out the boiler when DHW is called. This keeps the gas rate below the maximum of the U6 meter. Anyone can do this themselves with an off the shelf flowswitch, which is all Rinnai are doing and I have done this in the past. If you go to a larger U16 meter and mains supply pipe, you may as well just have the larger Rinnai and a cheaper separate boiler and no flow switch as the gas supply will cope.
In this situation, if 4 showers have to be run at once (this will be a rare event) and there is no upgrade to a U16 meter, then it is best to consider two combi boilers sized just below the 6 cu metres of the U6 meter. This will do it and the cheaper option. a 28 and 30 KW will usually be below the 6 cu meter/minute of the U6 meter. The house is big enough to zone up the heating and have a combi do each floor. If a fast bath fill is needed then joining the DHW outlets with non-return valves can be done only for the bath run. The two units can be above each other and quick to fit as both are in the same location.
D
Deleted member 105431
More cut and paste advice from george drivel.
Two combi's is a stupid idea when the rinnai does the job perfectly. George drivel strikes again.
Two combi's is a stupid idea when the rinnai does the job perfectly. George drivel strikes again.
Preciselyneed to read a little more closely and the Ethos 25l/m is not for a 35 degrees rise but for 30c and for a maximum dhw flow of 40c...
rinnia is technically a superior product with much finnier control of dhw temp and with some clever external controls. The twinflow is their way of putting the best with the best.
The best water heater with the best CH boiler(ATAG)
You can have fit the rinnai with any CH boiler the OP likes
rinnia is technically a superior product with much finnier control of dhw temp and with some clever external controls. The twinflow is their way of putting the best with the best.
The best water heater with the best CH boiler(ATAG)
You can have fit the rinnai with any CH boiler the OP likes
G
GeorgeBramwell
The Rinnai is a superior product and well made, however the gas consumption is high as it is anon-condensing boiler.
When pushing the the limits of a U6 meter the condensing combis are the way. If using a U16 meter then a Rinnai.
When pushing the the limits of a U6 meter the condensing combis are the way. If using a U16 meter then a Rinnai.
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