Just installed Hudson Reed wall mounted bathroom taps only to find they are high pressure.Cold is mains fed and works ok. Hot is not adequate to keep plunger valve open on the shower attachment. I have already installed a pump for new shower.Presumably Can "T" of this for both hot and cold (cant do hot only checked with manufacturer), but will i have sufficient cold reserves to fill hot tank and fill bath at same time? If i go separate hot only pump will this have an adverse effect on existing kitchen hot tap and washing machine? thanks.