Hi all,
Long time reader, first time poster.
I am in the process of project managing our long planned self build bungalow and am trying to stay a couple of steps ahead of the next decision I have to make!!
We currently live in a small semi-detached with a fairly old combi boiler running off LPG (rural area - no natural gas). Granted, we only have one bathroom and one extra sink in the kitchen but I really love the fact I can get hot water any time. There is myself, my husband and 2 children under 5.
Our new build is also outside mains gas but larger (2500sq ft) with one main bathroom, 2 en suites, one of which I envisage installing an electric shower in. I am hoping given the amount of insulation we are putting in, the heating will not need to be on for quite a few months in the summer, therefore making me lean towards a new, higher powered combi boiler.
However (and I realise this question has been posed and discussed before) I appreciate we will have significantly more demand for hot water than currently. My problem is that I am dealing with projected pressures and flow rates given by the water service which do not seem great......they are quoting the minimum pressure at 1.5 bar and minimum flow rate of 9l/minute. The main water pipe is due for an upgrade but goodness knows when they will get around to it.
My understanding is, even with a system boiler and cylinder I would still need good flow rate and as my preference is to lean towards combis, I then began investigating the storage combis (mainly Valliant ecoTec Plus 937 / Viessman Vitodens 222-F 35kW / Gloworm Ultracom 2 35 store / Alpha CD50) but now my head hurts and am getting more confused the more I read!!! I also looked at the higher powered WB combi boilers but again, my understanding is that the output is only as good as the cold water input.
I believe the mains water pipe coming from the mains to the house will be 25mm.
Can any of you nice forum people give me any words of advice??
Yours in hope........
Long time reader, first time poster.
I am in the process of project managing our long planned self build bungalow and am trying to stay a couple of steps ahead of the next decision I have to make!!
We currently live in a small semi-detached with a fairly old combi boiler running off LPG (rural area - no natural gas). Granted, we only have one bathroom and one extra sink in the kitchen but I really love the fact I can get hot water any time. There is myself, my husband and 2 children under 5.
Our new build is also outside mains gas but larger (2500sq ft) with one main bathroom, 2 en suites, one of which I envisage installing an electric shower in. I am hoping given the amount of insulation we are putting in, the heating will not need to be on for quite a few months in the summer, therefore making me lean towards a new, higher powered combi boiler.
However (and I realise this question has been posed and discussed before) I appreciate we will have significantly more demand for hot water than currently. My problem is that I am dealing with projected pressures and flow rates given by the water service which do not seem great......they are quoting the minimum pressure at 1.5 bar and minimum flow rate of 9l/minute. The main water pipe is due for an upgrade but goodness knows when they will get around to it.
My understanding is, even with a system boiler and cylinder I would still need good flow rate and as my preference is to lean towards combis, I then began investigating the storage combis (mainly Valliant ecoTec Plus 937 / Viessman Vitodens 222-F 35kW / Gloworm Ultracom 2 35 store / Alpha CD50) but now my head hurts and am getting more confused the more I read!!! I also looked at the higher powered WB combi boilers but again, my understanding is that the output is only as good as the cold water input.
I believe the mains water pipe coming from the mains to the house will be 25mm.
Can any of you nice forum people give me any words of advice??
Yours in hope........