Queries
Heatmaster 85tc, out I think on cost alone, along with potential meter problems etc, to get full potential of it may have to upgrade pipework in the house, so too much to consider.
Still weighing pros and cons of 35/45 tc unit. easier connection all round. Still base cost will be more than decent sized unvented cylinder and system boiler. Back down to a lower flow rate with this one but still ok I think.
1. price consideration, which is going to cost me less to run over 5 years.
300 lt with great boiler say 30 - 40kw. Guess I'd have to heat a tank in the morning (majority used 1st thing), need a little during the day and say half a tank in the evening. It has to be at optimum heat between. 6 - 8.30 in morning and 5.30 - 8.30 in evening. Presume would need Boiler on heating 3 hrs a day.
The 45tc, 100 litre tank combi system. So still need to pre heat 100 litres in morning (1/2 hour), ready for morning rush. But rest could be on demand say another hour. 1.5 hrs a day. I have no idea how much gas is!
Then theres the central heating, which I presume would be same for both? On this basis think heating cost overall would be half, but may have that totally wrong.
2. One thing bothering me about both systems, seems both would be subject to a certain amount of limited pressure in the system and the same pipe sizes delivering the water throughout the house. Is there any reason from a pressure point of view one would be better than the other, remembering I want 3 showers running at exactly same time and rather it wasn't 3 dribbles? Question is about pressure rather than heat now for feel either system could deliver the hot water.
Guidance appreciated:confused5:
