Hi All I've just moved into a house that has hot water supplied by an electric immersion heater. The small cold water tank is the top part of the hotwater cylinder. When running a bath the cold tank seems to empty far quicker than it can refill from the mains. Consequently the hot water starts to splurge out; still hot though. Taking a shower which is fed from these tanks has woefully low pressure and a piddly experience. I could put a pump on this but a shower would then be short but sweet! And I could replace the cylinder with a loft cold tank and standard hot water cylinder. There is also an electric shower (10kW), but this too is rather poor. So, I was considering a gas powered water heater to provide "continuous" hot water at mains pressure. Several models seem to be available at the £450 price point that have flow rates from 10 to 16 l/min. The central heating is by warm air. Don't know how efficient these systems are. My questions are (sorry, there are lots): Do you need special gas pipework (wider) for these gas water heaters? I couldn't find any reference to this in the installation instructions (or didn't know what to look for). I will not be fitting it myself. Are the following brands any good: Ariston, Rinnai, Main, Vokera. Any others that may be a good choice? Or can you use a normal combi boiler and simply not use the heating part, or maybe just have a towel rail if it needs a minimum load. Or maybe time to install a full radiator system. What's the current opinion on rad location; under window or other wall? Can you put a heater/combi on a stud wall? I think I read that they might be noisy in this situation. Thanks for reading and any comments.