Which system would you choose?

[Barn_Style]

4 bed semi-detached barn conversion over 3 floors. 18 radiators, two bathrooms, one d/s cloaks.

Any pros and cons to the below system boiler set ups? Which would you choose? Want to be able to run two showers simultaneously without an issues.

Option 1
Vaillant ecoTEC Plus 624
Gledhill stainless lite unvented 180l
Magnalean atom filter
Nest 3rd generation thermostat & stand
£3900 fitted (inc removal of current boiler and gledhill boilermate)

Option 2
Vaillant ecoTEC Plus 630
Heatrae Sadia Megaflo Eco Slimline Indirect 200i Cylinder
Magnalean atom filter
Nest 3rd generation thermostat & stand
£5000 fitted (inc removal of current boiler and gledhill boilermate)

 

[Gasmk1]

By removal I presume they just mean old boiler and cylinder not new rads

 

[Barn_Style]

By removal I presume they just mean old boiler and cylinder not new rads

Yes keeping existing rads

 

[Gasmk1]

Is water pressure/flow rate good enough for 2 showers. I personally prefer megaflo cylinders. Both similar in price for appliances and cylinder so it’s a case of which engineer you prefer. There is a thousand pound difference without seeing job hard to tell but I would expect somewhere around £4500

 

[Barn_Style]

Is water pressure/flow rate good enough for 2 showers. I personally prefer megaflo cylinders. Both similar in price for appliances and cylinder so it’s a case of which engineer you prefer. There is a thousand pound difference without seeing job hard to tell but I would expect somewhere around £4500

Its the same engineer. Option 1 was his spec, Option 2 was ours

 

[Barn_Style]

Its the same engineer. Option 1 was his spec, Option 2 was ours

Its the same engineer. Option 1 was his spec, Option 2 was ours

Is water pressure/flow rate good enough for 2 showers. I personally prefer megaflo cylinders. Both similar in price for appliances and cylinder so it’s a case of which engineer you prefer. There is a thousand pound difference without seeing job hard to tell but I would expect somewhere around £4500

Water pressure is approximately 7 litres per minute

 

[Gasmk1]

7 litre per min is very low you won’t get 2 showers running with that

 

[ShaunCorbs]

Also not suitable for an unvented you need a min of 20 lpm ideally for two 35 lpm dynamic

Also 4 bar pressure

Also has anyone carried out a heat loss to see what size boiler you actually need ?

 

[Barn_Style]

7 litre per min is very low you won’t get 2 showers running with that

I did some random test I found on youtube using a jug and filling it for 6 seconds.

 

[Barn_Style]

I did some random test I found on youtube using a jug and filling it for 6 seconds.

What do you think our options are re water pressure?

 

[ShaunCorbs]

How long to fill a 1l container eg bottle etc

 

[ShaunCorbs]

To boost / increase the water yourselves or install an old style system eg tanks in the loft

 

[Barn_Style]

I did some random test I found on youtube using a jug and filling it for 6 seconds.

How long to fill a 1l container eg bottle etc

700mls in 6 seconds. 0.7 x 10 = 7 litres per minute

 

[Barn_Style]

Also not suitable for an unvented you need a min of 20 lpm ideally for two 35 lpm dynamic

Also 4 bar pressure

Also has anyone carried out a heat loss to see what size boiler you actually need ?

No. I found this information online: 1.5kw per radiator and +3 kw for the tank= 30kw

 

[ShaunCorbs]

Have a look at this if you really want an unvented cylinder 8.56 for a litre

EsyBox | DAB Pumps

EsyBox by DAB is for pressurization, gardening, irrigation, agriculture and irrigation and to draw water in residential building service and commercial building service. It is "all-in-one" and ready to use for an easy and efficient management of residential pressurization: the presence of the...

dabpumps.com

EsyTank | DAB Pumps

dabpumps.com

Also would do a Heatloss for the property as you maybe oversizing by a lot at 30kw

 

[IND_Nick]

As above you definitely need to look at the pressure and flow rates of the mains to use two bathrooms at once. The Esybox system Shaun has linked to is an excellent option to solve this.
I would also look at splitting the heating system if possible. Really you should be able to control each floor separately with a thermostat on each floor. This isn't always possible if you are using the existing rads and pipework but I would definitely ask for it to be looked into.
I would try and specify to local engineers what you want in performance and then let them work out how etc. That way they do all the working out and are responsible for it performing correctly once completed.