Mefaflo/Megaflow systems?

[eldar]

I'm having my combi boiler replaced. Plumber has recommended a megaflow system, with a new boiler and a hot water tank, which should improve hot water (2 bathrooms, miserable hot water in winter).

Suggests a Baxi megflow 28 HE boiler and a Baxi S 170l tank. As the existing boiler is a baxi, and as reliable as a 1972 lada, I'm hot convinced a new system will be any better. Am I being paranoid, or have they improved?

The estimate is £2,500, inc. VAT, is this reasonable?

[eldar]

Hereward said:

Ferg said:

Depends what pipework is there already.

What I always bang on about on these threads is that you MUST have enough flow to run an unvented cylinder. I wouldn't consider installing one on less than 25 litres a minute and with less than 3Bar coming in.

Indeed. If the heating engineer didn't check flow and pressure then he's not the right man for the job.

The plumber did check pressure and flow, 3 bar and 17 l/min. Low flow, but explained by the 22mm incoming main being 'throttled down' by 15mm piping to the taps. He would replace the 15mm with 22 from the main to the tank. Sound reasonable?

[eldar]

Got the system fitted, on time, on budget.

Works perfectly, all the combi problems eliminated

Good advice here.

[eldar]

The extra cost of a megaflow in a new installation is small, a couple of hundred. No brainer.

[eldar]

furtive said:

I'm in the middle of buying a house with a megaflow installed. Can someone please enlighten me as to what they are and how they differ from a regular boiler and hot water tank arrangement?

Pretty much the same in principle. Boiler heats hot water in a tank. Difference is that the tank is at mains pressure, and the water is heated by a condensing boiler (or an ordinary one.)