Potty Netaheat 10/16 recommended replacement

[davetherave]

Need some advice.

Have a Potty Netaheat 10/16 in our new place which has apparently not been serviced in years. Currently heats rads. as well as water when "hot water only" requested. (Valve problem?) Anyway; not that I'm looking to replace the valve as have been reading other posts re. it being a widowmaker. Also have a leaky immersion. So am looking to replace the lot with a new system. Maybe Vaillant or WBosch plus megaflow?
House has 4 beds, plus two bathrooms (one attic room with en-suite shower).

Having a b**g*r of a job deciding what to replace it with. General idea is that current rads. would stay (but need cleaning out) and new showers (not electric) be fitted in each bathroom.

Any recommendations on the type of set-up and products greatly appreciated. Would like something energy efficient (suspect nearly all new ones are, anyway) and well made (been reading about the Italian jobs, so don't fancy one of those!).

Thanks.

 

[Agile]

The Italian boilers are fine as long as they are properly installed on a clean system. Its sometimes said that some Vaillants are assembled in Italy and some models have used an Italian heat exchanger!

A conventional system with an unvented should suffice as long as the mains supply is adequate.

As always I would advise you to take advice from a competent CORGI installer.

Tony

 

[gas4you]

I would recommend the Vaillant Ecotec Plus 615 or 618 depending what output your current boiler is set to and couple this together with a Vaillant Unistor unvented cylinder, link the 2 together with a VR65 and install a VR10 ntc on the unistor instead of the stadard cyl stat.

The boiler and cylinder will then 'talk' to each other to give plenty of hot water in the most efficient and economic way.

You need to make sure you have at least 3 bar mains pressure and a 22mm cold mains supply to culinder though.

 

[ChrisR]

Unvented cyls have very high capacity coils , so a larger boiler might get used if you'll have high HW demands.

 

[davetherave]

Thanks to all for your time and advice. Much appreciated. As always, I've learned more new things. And given what's been said in previous posts about the current boiler, I might make sure I'm out of the house when it's removed.

All the best